A sore throat is pain, scratchiness, or irritation in the throat that typically worsens when you swallow. It’s one of the most common reasons people visit a doctor, and the vast majority of cases (85% to 95% in adults) are caused by viruses rather than bacteria. Most viral sore throats resolve on their own within three to ten days without any specific treatment.
What Causes a Sore Throat
The throat becomes sore when tissues in the back of the mouth and upper airway become inflamed. This inflammation is usually triggered by an infection, but not always. The causes fall into three broad categories: viral infections, bacterial infections, and non-infectious irritants.
Viruses are responsible for the overwhelming majority of sore throats. The most common culprits are the same ones behind ordinary colds and respiratory illnesses: rhinovirus, influenza, adenovirus, coronavirus, and parainfluenza. Less common viral causes include the Epstein-Barr virus (which causes mono), herpes viruses, and coxsackievirus. When a virus is to blame, you’ll often have other symptoms alongside the throat pain: a cough, runny nose, hoarseness, headache, or pink eye.
Bacterial infections account for a smaller but important share. Group A streptococcus, the bacterium behind strep throat, causes about one-third of sore throats in children aged 5 to 15. In adults and younger children, only about 10% of sore throats are strep. The distinction matters because strep requires antibiotics, while viral sore throats do not.
Non-infectious causes are easy to overlook. Acid reflux can send stomach acid all the way up into the throat, a condition called laryngopharyngeal reflux. Unlike typical heartburn, this form of reflux primarily irritates the voice, throat, and sinuses, and many people don’t feel the classic burning in the chest at all. Allergies, dry indoor air, smoking, secondhand smoke, and heavy voice use can all produce a sore throat without any infection being involved.
Viral vs. Bacterial: How to Tell the Difference
This is the question most people really want answered, because the treatment path depends on it. A viral sore throat tends to come packaged with cold symptoms: coughing, a runny nose, sneezing, and sometimes a hoarse voice. These clues suggest a virus rather than strep.
Strep throat, by contrast, tends to hit harder and more specifically. Doctors use a set of four clinical signs to estimate the likelihood of strep: a fever of 100.4°F (38°C) or higher, no cough, swollen lymph nodes at the front of the neck, and swelling or white patches on the tonsils. Each sign present adds one point on a scale of zero to four. A score of zero or one makes strep unlikely, while a score of three or four raises the probability enough to warrant a rapid strep test or throat culture. No combination of symptoms alone is enough to confirm strep, which is why a test is needed before antibiotics are prescribed.
How Long It Lasts
A viral sore throat typically improves within three to ten days. The worst pain is usually in the first two or three days, then gradually fades. If your throat is still getting worse after a week, or if it hasn’t improved at all after ten days, that’s a reason to get checked.
A bacterial sore throat treated with antibiotics generally starts improving within a day or two of starting the medication, though the full course of antibiotics (usually ten days) needs to be completed. Without treatment, strep throat can linger longer and carries a small risk of complications like rheumatic fever or kidney inflammation.
Managing the Pain at Home
Since most sore throats are viral and will resolve on their own, the main goal is comfort. Over-the-counter pain relievers are the most effective option. Acetaminophen (Tylenol) taken regularly, up to four times per day, provides consistent pain relief. Anti-inflammatory options like ibuprofen (Advil, Motrin) are a good alternative and may help reduce throat swelling alongside pain.
Beyond medication, a few simple habits make a noticeable difference. Warm liquids like broth, tea, or warm water with honey soothe irritated tissue. Cold items like ice chips or popsicles can numb the area temporarily. Keeping the air in your home humidified prevents the throat from drying out overnight, which is when many people notice the pain is worst. Gargling with warm salt water (about half a teaspoon of salt in a glass of warm water) can provide short-term relief, though the effect doesn’t last long.
When a Sore Throat Needs Attention
Most sore throats don’t need medical care. But certain patterns suggest something more serious is going on. A sore throat with a fever above 101°F that lasts more than two days, significant difficulty swallowing (especially liquids or your own saliva), a muffled or “hot potato” voice, swelling visible on one side of the throat, or trouble opening your mouth fully can point to complications like a peritonsillar abscess, which needs prompt treatment.
Any sore throat accompanied by difficulty breathing, drooling because swallowing is too painful, or significant neck swelling warrants immediate care. In children, a sore throat lasting more than a couple of days with a fever, especially if cough is absent, is worth a strep test to avoid untreated infection.
Sore Throats From Reflux
If your sore throat keeps coming back or never fully goes away, and tests for infection are negative, acid reflux may be the cause. Laryngopharyngeal reflux can produce a chronic scratchy throat, the sensation of something stuck in the back of the throat, postnasal drip, and voice changes. Because it doesn’t always come with heartburn, many people don’t connect it to their stomach.
Several lifestyle factors can make reflux worse: lying down too soon after eating, large meals, tight clothing around the abdomen, smoking, and alcohol. Coffee, chocolate, mint, garlic, and onions can also relax the valve between the stomach and esophagus, allowing acid to travel upward. Adjusting these habits often reduces throat symptoms significantly without medication. Sleeping with the head of your bed slightly elevated and avoiding food within two to three hours of bedtime are two of the most effective changes.