Tonsillitis vs Strep Throat: How to Tell the Difference

Tonsillitis and strep throat are closely related terms, but they do not mean exactly the same thing. Tonsillitis describes inflammation of the tonsils, usually caused by a virus and sometimes by bacteria. Strep throat is a bacterial infection caused by group A Streptococcus, often shortened to group A strep or GAS. It can inflame the tonsils, the surrounding throat or both.

This means a child or adult can have tonsillitis without having strep throat. They can also have a group A strep infection that doctors describe as bacterial tonsillitis. Looking at the throat alone does not always reveal which is present: white spots, swollen tonsils and severe pain can occur with both viral and bacterial infections.

The distinction matters mainly because ordinary viral tonsillitis does not improve with antibiotics, while selected bacterial infections may benefit from them. Scarlet fever—group A strep accompanied by a characteristic rough rash—should be assessed and treated promptly.

Most sore throats settle within approximately one week. The priorities are maintaining fluids, controlling pain and recognising symptoms that suggest dehydration, a deep throat infection, breathing difficulty or invasive group A strep.

What is the difference between tonsillitis and strep throat?

The simplest way to understand the difference is that tonsillitis describes where the inflammation is, while strep throat describes one possible cause.

The tonsils are two pads of immune tissue at the back of the throat. When they become inflamed, enlarged and painful, the condition is called tonsillitis. It can result from:

• common cold viruses;
• influenza and other respiratory viruses;
• adenovirus;
• Epstein–Barr virus, which causes glandular fever;
• group A streptococcal bacteria;
• less common bacterial infections.

Strep throat is specifically caused by group A Streptococcus pyogenes. The bacteria may inflame the tonsils, the throat lining or both. In UK practice, the same illness may be described as:

• strep throat;
• streptococcal pharyngitis;
• streptococcal tonsillitis;
• group A strep throat infection;
• bacterial tonsillitis.

The terminology can therefore overlap. A clinician may say “tonsillitis” based on the examination and then decide whether group A strep is likely enough to influence treatment.

No single row in this table proves the cause. Viral tonsillitis can be severe, and strep throat can occasionally present less typically.

Is every bacterial sore throat strep throat?

No. Group A strep is the best-known bacterial cause, but other bacteria occasionally cause throat infections.

Most uncomplicated acute sore throats are still viral. This is why antibiotics are not automatically prescribed simply because the tonsils look inflamed.

Can someone have strep throat without tonsils?

Yes. Removing the tonsils reduces episodes of tonsillitis but does not remove the surrounding throat tissue. Group A strep can still infect the pharynx after tonsil surgery, although the appearance and symptoms may differ.

What symptoms are common to both conditions?

Viral tonsillitis and strep throat overlap substantially. Both may cause:

• a painful or scratchy throat;
• pain when swallowing;
• red, swollen tonsils;
• white spots, streaks or coating on the tonsils;
• fever;
• swollen neck glands;
• headache;
• bad breath;
• reduced appetite;
• tiredness and irritability;
• earache caused by pain travelling from the throat.

The amount of pain does not reliably distinguish them. A viral infection can make swallowing extremely painful, while some people with group A strep have relatively moderate symptoms.

White spots do not automatically mean antibiotics are needed

White material on the tonsils is called exudate. It consists of inflammatory cells, mucus and debris produced as the immune system responds to infection.

Exudate can appear with:

• strep throat;
• viral tonsillitis;
• glandular fever;
• other less common infections.

Photographs taken with a phone torch cannot reliably diagnose the cause. The pattern of symptoms, age, exposure and clinical examination matter more than whether one white patch is visible.

Why can tonsillitis cause ear pain?

The throat and ears share nerve pathways. Inflammation in the tonsil can therefore be felt as pain in the ear even when the ear itself is healthy.

Persistent ear pain, discharge, reduced hearing or symptoms affecting only one side may indicate an ear infection or another ENT problem and should be assessed separately.

Can either condition cause bad breath?

Yes. Inflammation, reduced eating and drinking, mouth breathing and material collecting around the tonsils can all contribute.

Bad breath that persists after the infection clears may have another cause, including dental disease, gum problems, chronic sinus symptoms or tonsil stones.

Which symptoms make strep throat more likely?

No symptom confirms strep throat on its own, but a particular combination raises its likelihood.

Features that make group A strep more plausible include:

• rapid onset of a painful throat;
• fever during the previous 24 hours;
• pus or significant inflammation on the tonsils;
• very inflamed tonsils;
• tender glands at the front of the neck;
• absence of cough;
• absence of a runny nose;
• symptoms developing within the previous three days;
• contact with someone who has confirmed strep throat or scarlet fever;
• a fine rough rash compatible with scarlet fever.

Symptoms such as cough, hoarseness, runny nose, mouth ulcers and red watery eyes are more suggestive of a viral infection, although overlap remains possible.

FeverPAIN

UK clinicians may use the FeverPAIN score when deciding how likely a streptococcal infection is.

One point is given for each of the following:

• Fever during the previous 24 hours;
• Purulence, meaning pus on the tonsils;
• Attend rapidly, meaning symptoms began within three days;
• Severely inflamed tonsils;
• No cough or coryza, meaning no cough or runny nose.

A low score makes bacterial infection less likely and antibiotics are generally not offered. A higher score does not prove strep throat, but it indicates that antibiotics may be more useful and that the person deserves closer clinical assessment.

Centor criteria

Another tool is the Centor score, based on:

• tonsillar exudate;
• tender lymph nodes at the front of the neck;
• fever;
• absence of cough.

These scores support clinical judgement. They are not designed for parents to calculate online and then use to start leftover antibiotics.

Does strep throat always cause fever?

No. Fever is common but not universal. Partial immunity, early presentation, fever-reducing medicine and individual variation can alter the pattern.

Does strep throat always cause white spots?

No. The tonsils may be bright red and swollen without obvious exudate. Conversely, white spots can occur during viral illness.

What is scarlet fever?

Scarlet fever is caused by group A strep bacteria that produce toxins capable of causing a distinctive rash.

The illness often begins with:

• sore throat or tonsillitis;
• fever;
• headache;
• swollen neck glands;
• nausea or abdominal discomfort.

A rash generally appears after the early throat symptoms. It consists of small raised bumps that make the skin feel rough like sandpaper.

Where does the rash begin?

The rash commonly starts on the chest or abdomen and spreads to the neck, arms and legs.

It may be less obvious on brown or black skin, but the rough texture can still be felt. The cheeks may appear flushed while the area around the mouth looks relatively pale.

What is strawberry tongue?

The tongue may initially have a white coating. As this clears, the surface can become bright red, swollen and covered in prominent bumps, producing the term “strawberry tongue”.

This appearance can occur with scarlet fever but is not exclusive to it.

What should you do if scarlet fever is suspected?

Contact the GP practice or NHS 111. Antibiotic treatment is recommended because it:

• reduces infectiousness;
• may shorten symptoms;
• reduces the likelihood of some complications;
• helps limit spread through schools and households.

Someone diagnosed with scarlet fever should stay away from nursery, school or work until at least 24 hours after beginning appropriate antibiotics.

Do not enter a GP waiting room without checking first if scarlet fever or another highly contagious infection is suspected.

Can the skin peel afterwards?

Yes. As the rash fades, peeling can develop around the fingertips, toes or groin. This can continue after the child otherwise feels well.

Redness, swelling, pus or significant pain suggests secondary infection rather than ordinary peeling.

How are tonsillitis and strep throat diagnosed?

Diagnosis usually begins with the history and examination rather than an immediate laboratory test.

A clinician may ask:

• when the symptoms began;
• whether there is cough or a runny nose;
• how high the temperature has been;
• whether the person can drink and swallow saliva;
• whether there is a rash;
• whether anyone nearby has scarlet fever or strep throat;
• whether tonsillitis keeps returning;
• whether there is severe tiredness or prolonged swollen glands;
• whether the person has a weakened immune system.

The examination may include the tonsils, mouth, neck glands, ears, breathing and hydration.

Are throat swabs always needed?

No. Throat cultures and rapid antigen tests are not routinely necessary for every uncomplicated sore throat in UK primary care.

A swab may be considered when:

• the diagnosis is uncertain;
• symptoms are persistent or recurrent;
• there is an outbreak;
• the person has a high risk of complications;
• treatment has not worked as expected;
• a less common infection is being considered.

A positive swab does not always prove that group A strep caused every symptom. Some people carry the bacteria in the throat without illness and may simultaneously have a viral infection.

What are rapid strep tests?

Rapid antigen tests look for group A strep material in a throat sample and can produce a result quickly.

Their accuracy depends on:

• how well the sample is taken;
• the specific test used;
• how common strep infection is in the tested population;
• whether the person is a symptom-free carrier.

A home test should not override urgent symptoms or replace clinical assessment in a seriously unwell child.

When is glandular fever considered?

Glandular fever, caused by Epstein–Barr virus, can produce severe tonsillitis with heavy white exudate.

It is more likely when there is:

• profound tiredness;
• large swollen glands, including towards the back of the neck;
• symptoms lasting longer than an ordinary sore throat;
• enlargement of the liver or spleen;
• a widespread rash after taking amoxicillin or ampicillin.

Blood testing may be considered, although tests can be negative early in the illness.

Your broader guide to tonsillitis symptoms, causes and treatment covers recurrent infection and tonsil removal in more detail.

When are antibiotics needed?

Most acute sore throats improve without antibiotics. NICE advises that the average illness lasts around one week and that withholding antibiotics is unlikely to cause complications in most otherwise healthy people.

Antibiotics are therefore not prescribed simply because the throat hurts badly or the tonsils look red.

When antibiotics may be considered

A clinician may recommend an immediate or delayed prescription when:

• FeverPAIN or Centor features suggest a higher likelihood of bacterial infection;
• scarlet fever is suspected or confirmed;
• the person is systemically very unwell;
• there are signs of a serious complication;
• the person has a high risk of complications because of another medical condition;
• symptoms are deteriorating rather than following the expected course.

What is a delayed antibiotic prescription?

A delayed prescription is provided but used only if symptoms fail to improve within a specified period or become significantly worse.

This approach allows time for a likely viral infection to resolve while providing a treatment route if the illness does not follow the expected pattern.

The clinician should explain exactly when to start the medicine. Do not interpret “delayed” as meaning it should automatically be taken that evening.

Which antibiotic is used?

Phenoxymethylpenicillin, also known as penicillin V, is commonly recommended for suspected streptococcal sore throat when antibiotics are indicated.

An alternative may be prescribed for someone with a genuine penicillin allergy or another medical reason not to take it.

Tell the clinician whether a previous reaction involved:

• a mild delayed rash;
• hives;
• facial or throat swelling;
• wheezing;
• collapse;
• severe blistering skin disease.

These reactions have very different implications.

Why should the full course be completed?

Take the antibiotic according to the prescribed dose and duration, even if symptoms improve quickly.

Stopping early or taking doses irregularly may leave the infection insufficiently treated. Do not save leftover doses for a future sore throat.

How quickly should antibiotics work?

Symptoms do not disappear immediately. Some improvement may occur within one or two days, but pain and tiredness can continue.

Seek advice if the person:

• becomes worse after starting treatment;
• cannot drink;
• develops breathing difficulty;
• develops one-sided swelling or a muffled voice;
• has no meaningful improvement after the period advised by the prescriber;
• develops signs of an allergic reaction.

Antibiotic side effects

Possible effects include nausea, abdominal discomfort, diarrhoea and rash.

Call 999 for swelling of the lips, tongue or throat, breathing difficulty, wheezing, collapse or another sign of anaphylaxis.

How can throat pain be treated at home?

Whether the infection is viral or bacterial, supportive care remains important. Antibiotics do not replace fluids and pain relief.

Use appropriate pain relief

Paracetamol or ibuprofen may reduce throat pain and fever when suitable for the person and taken according to the instructions.

Do not give aspirin to anyone under 16 unless it has been specifically prescribed.

Ibuprofen may not be suitable for someone who:

• is significantly dehydrated;
• has certain kidney conditions;
• has a history of stomach ulcers;
• has previously reacted to anti-inflammatory medicines;
• is pregnant;
• takes particular anticoagulant or other medicines.

Ask a pharmacist when uncertain.

Prioritise fluids

Throat pain often makes children eat less. A temporary reduction in food is usually less important than insufficient fluid.

Offer frequent small amounts of:

• cool water;
• milk;
• usual breastfeeds or formula feeds;
• oral rehydration solution when advised;
• ice lollies;
• warm drinks if they feel more soothing.

Some people prefer cold drinks, while others find warmth more comfortable. Either is acceptable if it encourages drinking.

Choose easier foods

Soft foods may include yoghurt, cooled porridge, soup, mashed potato, banana, scrambled egg, soft pasta or custard.

Spicy, acidic, rough or very salty foods can sting an inflamed throat.

Gargling with salt water

Adults and older children who can gargle safely may find warm salty water soothing.

Young children should not gargle because they may swallow or inhale the liquid.

Throat lozenges and sprays

Some medicated lozenges provide modest short-term pain relief for adults and older children.

Check the minimum age and ingredients. Lozenges are a choking risk for younger children, and numbing products can be unsafe when overused.

A pharmacist can advise on a product suited to the person’s age, pregnancy status and other medicines.

Rest and avoid irritation

Resting the voice, avoiding smoking and vaping, and keeping away from smoky environments can reduce irritation.

Dry heated rooms may worsen discomfort. Regular drinks and reasonable ventilation can help.

For a wider overview of non-infectious causes and home relief, see sore throat causes, home relief and when to see a GP.

When is a sore throat an emergency?

Most cases are painful but uncomplicated. Certain symptoms suggest that swelling or infection is affecting deeper tissues or the airway.

Difficulty breathing

Call 999 if the person:

• is struggling for breath;
• has noisy breathing or stridor;
• cannot speak normally because of breathlessness;
• has blue or grey lips;
• is pulling in beneath the ribs;
• appears exhausted from breathing.

Unable to swallow saliva

Drooling in a person who normally manages saliva can indicate severe pain or obstruction.

A young child may dribble during an ordinary throat infection, but continuous drooling alongside breathing difficulty, an abnormal voice, neck swelling or inability to drink requires urgent assessment.

Quinsy

A quinsy, or peritonsillar abscess, is a collection of pus beside a tonsil. It commonly causes:

• severe throat pain mainly on one side;
• a muffled “hot potato” voice;
• difficulty opening the mouth;
• drooling;
• one tonsil appearing to push towards the centre;
• the uvula being pushed to the opposite side;
• ear pain on the affected side;
• difficulty drinking.

A suspected quinsy needs urgent same-day hospital or ENT assessment. It may require drainage as well as antibiotics.

Deep neck infection

Infection can occasionally spread behind or around the throat. Warning signs include:

• severe neck stiffness or swelling;
• pain when turning the neck;
• difficulty opening the mouth;
• drooling;
• rapid deterioration;
• breathing difficulty;
• a child holding the neck in an unusual position.

Severe dehydration

Seek urgent advice for:

• very little urine;
• no wet nappy for many hours;
• a dry mouth;
• sunken eyes;
• no tears;
• unusual drowsiness;
• cold hands and feet;
• dizziness or collapse.

Possible invasive group A strep

Most group A strep infections remain localised and improve with treatment. Rarely, the bacteria enter deeper tissues or the bloodstream.

Seek urgent help if a person with a recent sore throat or strep infection develops:

• rapidly worsening illness;
• extreme muscle pain;
• severe pain out of proportion to visible findings;
• fast breathing;
• confusion or difficulty waking;
• cold, pale, blue or blotchy skin;
• a rapidly spreading painful skin infection;
• persistent vomiting;
• very little urine.

How contagious are tonsillitis and strep throat?

The infection spreads through respiratory droplets, saliva and close contact. Shared cups, cutlery, towels and toys can also transfer organisms when contaminated by secretions.

Viral tonsillitis

Infectiousness depends on the particular virus. A person is commonly most contagious while feverish and during the early respiratory symptoms.

Children should remain at home while they have a fever or feel too unwell to participate normally.

Strep throat

Group A strep spreads through close contact and droplets. Appropriate antibiotics substantially reduce infectiousness, commonly within approximately 24 hours.

Follow the clinician’s advice regarding school, nursery or work because the required period depends partly on whether scarlet fever has been diagnosed.

Scarlet fever

Someone with scarlet fever should remain away from nursery, school or work until at least 24 hours after starting antibiotics.

The setting should be told so staff can follow current public-health advice and recognise linked cases.

Reducing spread at home

Helpful measures include:

• washing hands with soap and water;
• covering coughs and sneezes;
• disposing of tissues promptly;
• not sharing cups, bottles or cutlery;
• cleaning frequently touched surfaces;
• washing reusable drinks bottles;
• keeping toothbrushes separate.

Replacing a toothbrush is sometimes advised after treatment has begun, but evidence that this prevents recurrence is limited. The important steps are taking treatment correctly and not sharing oral-care items.

Should healthy siblings stay home?

Healthy contacts do not usually need exclusion solely because someone in the household has a sore throat.

Different advice may apply during a scarlet-fever outbreak or when a close contact is medically vulnerable. Follow instructions from the school, nursery or health protection team.

Recurrent tonsillitis and other causes of repeated sore throats

Repeated throat pain is not always repeated strep infection. Each episode may have a different cause, and symptoms between infections matter.

Possible explanations include:

• recurrent viral infections;
• recurrent bacterial tonsillitis;
• glandular fever;
• chronic nasal blockage and mouth breathing;
• allergy or post-nasal drip;
• acid reflux;
• smoking or vaping;
• tonsil stones;
• dry indoor air;
• a persistent dental or oral problem.

When is tonsil surgery considered?

Tonsillectomy may be considered when documented, severe episodes occur frequently enough to disrupt normal life and meet local NHS criteria.

The decision is not based on simply having large tonsils or several mild sore throats. Clinicians consider:

• how many significant episodes occurred;
• whether they were clinically consistent with acute tonsillitis;
• time missed from school or work;
• hospital admissions or quinsy;
• breathing or sleep problems;
• the risks and recovery burden of surgery.

Tonsillectomy reduces future tonsillitis but does not prevent every sore throat.

Could repeated “strep” results represent carriage?

Some children and adults carry group A strep in the throat without symptoms. A viral infection may then cause a sore throat while a swab detects the unrelated carriage.

This is one reason repeated testing and treatment should be guided by a clinician rather than performed independently whenever the throat feels sore.

When should persistent symptoms be investigated?

Arrange a medical assessment when:

• a sore throat lasts longer than expected;
• one tonsil remains substantially larger than the other after infection;
• there is persistent difficulty swallowing;
• there is unexplained weight loss;
• a neck lump does not resolve;
• there is ongoing hoarseness;
• blood appears in saliva;
• symptoms repeatedly affect one side only.

Most persistent symptoms still have a benign cause, but they should not be repeatedly treated as ordinary tonsillitis without examination.

Frequently asked questions about tonsillitis and strep throat

Is tonsillitis the same as strep throat?

No. Tonsillitis means inflamed tonsils and is often viral. Strep throat is a specific bacterial infection caused by group A strep and may involve the tonsils, throat or both.

Can viral tonsillitis have white spots?

Yes. White exudate can occur with viral tonsillitis and glandular fever as well as strep throat.

Does strep throat always have white spots?

No. The throat may be intensely red and painful without visible pus.

Can you diagnose strep throat by looking?

Not reliably. Symptoms, examination findings and sometimes testing are used together.

Is coughing common with strep throat?

A prominent cough makes group A strep less likely and suggests a viral respiratory infection, although it does not make strep impossible.

Does a runny nose mean the infection is viral?

It strongly supports a viral cause, particularly when accompanied by cough, hoarseness or red watery eyes.

Can strep throat cause a rash?

Yes. A fine rough rash caused by toxin-producing group A strep is called scarlet fever.

What does a scarlet-fever rash feel like?

It commonly feels rough like sandpaper and usually begins on the chest or abdomen before spreading.

Can adults get scarlet fever?

Yes, although it is most common in children. Adults with a compatible rash and sore throat should seek medical advice.

Can hand, foot and mouth disease cause tonsillitis-like symptoms?

It can cause fever and a painful throat, but painful mouth ulcers and spots or blisters on the palms and soles make it more likely. See hand, foot and mouth disease symptoms and care.

Can measles begin with a sore throat?

Measles may cause throat discomfort, but fever, cough, runny nose, red watery eyes and a rash beginning around the face are more characteristic. Read our guide to measles symptoms, risks and when to get help.

Do all cases of strep throat need antibiotics?

Antibiotic decisions are based on clinical likelihood, severity, risk of complications and whether scarlet fever is present. Most ordinary sore throats remain viral and do not benefit.

How long does viral tonsillitis last?

Many cases improve within three to seven days, although tiredness and mild throat discomfort can last longer.

How long does strep throat last?

Symptoms commonly begin improving over several days. Antibiotics may shorten the illness modestly and reduce infectiousness and selected complications.

How long after antibiotics can a child return to school?

For scarlet fever, UKHSA advises exclusion until at least 24 hours after antibiotics begin. The child should also be well enough to participate.

Can a child go to school with viral tonsillitis?

Keep the child home while feverish or too unwell to take part. They can usually return when they feel better and can manage normal activities.

Can tonsillitis cause vomiting?

Yes, especially in children. Repeated vomiting increases dehydration risk and may require medical advice.

Can strep throat cause stomach pain?

Children with group A strep sometimes develop nausea, vomiting or abdominal pain.

Why does swallowing hurt so much?

Swallowing moves inflamed throat and tonsil tissues. Severe local inflammation can therefore make even water painful.

What drinks are best?

Cool water, milk, ice lollies or warm drinks may help. The best choice is whichever encourages regular fluid intake without causing more pain.

Is ice cream helpful?

Cold soft foods may temporarily soothe the throat and provide calories. Ice cream does not treat the infection and should not replace fluids.

Can honey help?

Honey may soothe coughing or throat irritation in adults and children over 1 year. Never give honey to a baby under 12 months.

Should salt water be gargled?

Adults and older children who can gargle safely may find it soothing. It is unsuitable for young children.

Can a pharmacist help?

A pharmacist can recommend suitable pain relief, lozenges or sprays and identify symptoms that need GP or urgent assessment.

When should a throat swab be requested?

Routine swabbing is not needed for every sore throat. It may be useful during outbreaks, recurrent illness, treatment failure or diagnostic uncertainty.

Can strep throat come back after antibiotics?

Yes. Possible explanations include a new infection, incomplete treatment, close-contact transmission, bacterial carriage or a different illness.

Can untreated strep cause rheumatic fever?

Group A strep can rarely trigger rheumatic fever, which affects joints and sometimes the heart. It is now uncommon in the UK but remains one reason selected streptococcal infections are treated appropriately.

Can strep affect the kidneys?

Rarely, immune complications after infection can inflame the kidneys. Seek advice for dark urine, reduced urine, facial swelling or swelling around the ankles after a recent strep infection.

What is quinsy?

Quinsy is an abscess beside a tonsil. Severe one-sided pain, a muffled voice, drooling and difficulty opening the mouth require urgent assessment.

When should NHS 111 be contacted?

Contact NHS 111 for severe or worsening throat pain, inability to drink properly, possible scarlet fever, dehydration, persistent fever or uncertainty about how urgently the person needs assessment.

When should 999 be called?

Call 999 for breathing difficulty, blue or grey colour, collapse, difficulty waking, a seizure or inability to swallow saliva because the throat appears obstructed.