A sore, scratchy throat is one of the most common reasons people visit a UK pharmacy, especially once fewer daylight hours arrive and offices, schools and universities fill back up. For most people it settles on its own within a week, but working out whether you are dealing with a simple viral sore throat, tonsillitis, or something that genuinely needs antibiotics can be confusing, and it is one of the most common questions pharmacists hear.
This allergies and respiratory health guide covers what causes a sore throat and tonsillitis, how to recognise the symptoms, why most cases do not need antibiotics, when a pharmacist or GP might consider prescribing them, how to ease symptoms while your body clears the infection, and the warning signs that mean you should seek help urgently.
What causes a sore throat and tonsillitis
A sore throat happens when the lining of the throat becomes inflamed, and tonsillitis is the same process affecting the tonsils specifically, the two lumps of tissue at the back of the throat that help trap and filter germs before they travel further into the body. In the large majority of cases, both are caused by viruses, the same everyday viruses responsible for colds and flu, which spread easily through coughs, sneezes, shared cups and close contact.
A smaller proportion of cases, more often in children and teenagers than in adults, are caused by bacteria, most commonly group A Streptococcus, sometimes referred to as strep throat. Occasionally a sore throat is one of the early symptoms of glandular fever, particularly in teenagers and young adults, which tends to cause more prolonged tiredness and swollen glands than a typical viral throat infection.
Viral and bacterial sore throats can look and feel remarkably similar in the early stages, which is one reason clinicians are cautious about assuming a case is bacterial simply because it feels severe or has come on quickly. Severity alone is not a reliable way to tell the two apart.
Tonsillitis is most common in children and teenagers, since the tonsils are largest and most active earlier in life before gradually shrinking with age, but adults can and do get it too. Anyone can develop a viral sore throat at any age, and it tends to be more noticeable during the autumn and winter months when respiratory viruses circulate more widely in schools, workplaces and other crowded indoor settings.
Recognising the symptoms, including signs of strep throat
The core symptoms of a sore throat are pain or scratchiness when swallowing, redness at the back of the throat, and sometimes a mild fever, headache or swollen glands in the neck. With tonsillitis specifically, the tonsils themselves often look visibly swollen and red, and may develop white or yellow patches or spots of pus on their surface.
Certain features make a bacterial cause, particularly strep throat, somewhat more likely: a high temperature that comes on quickly, tender swollen glands at the front of the neck, white patches on the tonsils, and the absence of a cough or runny nose, symptoms that usually point more towards a virus. Children with strep throat sometimes also develop a fine, sandpaper-like rash across the body, known as scarlet fever, which needs its own specific advice from a pharmacist or GP.
None of these signs alone is definitive, and a pharmacist or GP, much as with a sinus infection, will weigh up the whole clinical picture, sometimes using a structured scoring tool, rather than relying on any single symptom to decide whether antibiotics are likely to help.
Why most sore throats do not need antibiotics
Because the great majority of sore throats and cases of tonsillitis are viral, antibiotics simply do not work against them and will not speed up recovery. Even when a bacterial cause is confirmed, evidence reviewed in UK prescribing guidance shows that antibiotics typically only shorten symptoms by around sixteen hours on average, a modest benefit that has to be weighed against the risk of side effects, allergic reactions, and the wider problem of antibiotic resistance building up across the population.
For this reason, NHS and NICE-aligned prescribing guidance favours a "no antibiotic" strategy for most otherwise well adults and children with a sore throat, or sometimes a "back-up" or "delayed" prescription that can be collected from a pharmacy if symptoms have not started improving after a few days. This is not a sign that your symptoms are being dismissed; it reflects good evidence about what genuinely changes the course of the illness.
Taking antibiotics when they are not needed does not just fail to help; it can also cause unnecessary side effects such as an upset stomach, and contributes to bacteria becoming resistant to antibiotics over time, which is a growing concern for the whole of the UK healthcare system.
When antibiotics may be considered
A pharmacist or GP will consider antibiotics in a smaller number of situations: when several features point strongly towards a bacterial infection, when symptoms are unusually severe, when someone has a health condition that makes infections riskier, such as a weakened immune system, or when a sore throat has not started to ease after about a week. Some pharmacies and GP surgeries can also carry out a rapid throat swab or use a structured scoring tool to help judge how likely antibiotics are to help in your individual case.
Where antibiotics are considered appropriate, phenoxymethylpenicillin (penicillin V) is the standard first-choice antibiotic for tonsillitis and strep throat under UK guidance, usually taken as a short course spread across the day. For people who are allergic to penicillin, a clinician may prescribe an alternative such as clarithromycin or erythromycin instead.
Easing symptoms while you recover
Whether or not antibiotics are needed, the mainstay of treatment is the same for almost everyone: regular paracetamol or ibuprofen taken as directed to control pain and fever, plenty of fluids, and rest. Gargling with warm salt water, sucking ice lollies or cold drinks, and throat lozenges or medicated sprays from a pharmacy can all help take the edge off the discomfort, even though how much difference they make varies from person to person.
Simple measures at home also make a difference: sitting upright rather than lying flat can ease discomfort, a cool-mist humidifier or a bowl of steaming water can soothe a dry, irritated throat, and avoiding smoking or smoky environments while you recover reduces additional irritation. Soft, easy-to-swallow foods are often more comfortable than anything crunchy or spicy until swallowing feels easier.
Most sore throats and cases of tonsillitis start improving within three to four days and are largely settled within a week to ten days, though a lingering tiredness can sometimes take a little longer to lift. A pharmacist can talk through which over-the-counter options are suitable for you, including for children, in pregnancy, or alongside any other medicines you already take.
For a child with a sore throat, keeping an eye on their fluid intake matters more than the sore throat itself; a child who is drinking, alert and making wet nappies or going to the toilet as usual is generally coping well, whereas one who is refusing all fluids needs prompt review. Younger children who cannot describe symptoms clearly may instead go off their food, seem unusually clingy or tired, or simply seem "not themselves", which is worth mentioning to a pharmacist or GP alongside any visible throat symptoms.
When to see a doctor or pharmacist urgently
Most sore throats can be safely managed at home, but some symptoms need prompt assessment rather than waiting it out. Seek urgent medical help if you or your child develop difficulty breathing or swallowing, are drooling more than usual, have a muffled or strained "hot potato" voice, or develop a very high temperature that will not come down with paracetamol or ibuprofen.
Severe pain on one side of the throat, particularly alongside difficulty opening the mouth fully, can occasionally signal a peritonsillar abscess (sometimes called quinsy), a complication that needs same-day medical assessment rather than home treatment. You should also get things checked if the sore throat has not started improving after a week of self-care, keeps recurring several times a year, or comes with a rash, joint pain, or an earache developing alongside it.
Tonsillitis that keeps coming back, generally meaning several significant episodes within a year, can sometimes be referred for a specialist ENT assessment to discuss whether further treatment, including tonsillectomy, could be appropriate. A pharmacist remains a good first point of contact for a sore throat and can advise you on exactly when a GP review is the right next step.