Most sore throats are caused by viral infections, like the common cold or flu, and will clear up on their own within three to ten days. A smaller but significant share are bacterial, most commonly strep throat. But viruses and bacteria aren’t the only culprits. Acid reflux, allergies, dry air, and even breathing through your mouth at night can leave your throat raw and painful.
What Makes Your Throat Hurt
When a virus or bacterium infects the tissue lining your throat, your immune system launches an inflammatory response. Damaged cells release a cascade of chemical signals, including prostaglandins and bradykinin, that do two things at once: they recruit immune cells to fight the infection, and they lower the activation threshold of pain receptors in the area. That means nerve endings that normally wouldn’t fire start responding to mild pressure, like swallowing saliva. It’s why a sore throat can feel disproportionately painful compared to how “sick” you actually are.
As the inflammation continues, additional immune cells arrive and release their own signaling molecules, which can further sensitize those nerve endings. This is also why sore throats tend to feel worst in the first two or three days, when the immune response is peaking, and then gradually improve as the infection is brought under control.
Viral Sore Throats vs. Strep Throat
The vast majority of sore throats in adults are viral. They typically come with other cold or flu symptoms: runny nose, cough, sneezing, mild body aches. These infections don’t respond to antibiotics, and they resolve on their own.
Strep throat is a bacterial infection caused by group A Streptococcus. It tends to hit differently: sudden onset of severe throat pain, pain when swallowing, fever, and sometimes white patches or pus visible on the back of the throat. A runny nose and cough are usually absent, which is one of the key distinguishing clues. Strep is more common in children than adults.
The only way to confirm strep is with a rapid strep test or a throat culture at your doctor’s office. If positive, the standard treatment is a 10-day course of antibiotics (typically penicillin or amoxicillin). Completing the full course matters even after you feel better, because it prevents complications like rheumatic fever.
Non-Infectious Causes
If your throat is sore but you don’t feel sick, something other than an infection may be irritating it.
Laryngopharyngeal reflux (LPR) is one of the most overlooked causes. Unlike typical acid reflux, which causes heartburn, LPR sends stomach acid all the way up to the back of the throat and voice box. You might not feel any chest burning at all. Instead, the hallmark symptoms are a persistent sore throat, hoarseness, excess mucus, a sensation of a lump in your throat, and a nagging cough. Mount Sinai describes LPR as “one of the most common diseases of the 21st century,” and many people with it are initially misdiagnosed with allergies or chronic sinus problems.
Post-nasal drip from allergies or sinus issues can also keep your throat irritated, especially in the morning. When mucus drains down the back of your throat overnight, it causes inflammation that accumulates. Dry indoor air, particularly in winter when heating systems are running, strips moisture from throat tissues and creates that scratchy, raw feeling. Sleeping with your mouth open, snoring, or using a CPAP machine can have the same effect.
Pain Relief That Actually Works
If you’re reaching for a pain reliever, ibuprofen outperforms acetaminophen for throat pain specifically. In a clinical trial comparing the two, a standard dose of ibuprofen reduced throat pain by 80% at three hours, while the same comparison dose of acetaminophen achieved only 50% relief. By six hours, the gap widened further: ibuprofen still provided 70% relief versus just 20% for acetaminophen. This makes sense because ibuprofen is an anti-inflammatory, so it targets the swelling that’s pressing on those sensitized nerve endings, not just the pain signal itself. Side effect rates between the two were comparable.
Saltwater gargles are a simple, low-cost option that genuinely helps. A common ratio is one teaspoon of salt dissolved in eight ounces of warm water. The hypertonic solution draws excess fluid out of swollen throat tissue, temporarily reducing inflammation. It also helps loosen mucus. Gargling a few times a day can take the edge off, though the relief is short-lived.
Other strategies that help: staying well hydrated (warm liquids like tea or broth feel particularly soothing), using a humidifier in dry rooms, and sucking on ice chips or throat lozenges to keep the throat moist. Cold foods like popsicles can numb the area temporarily.
How Long It Should Last
A typical viral sore throat improves steadily over three to ten days. The worst pain is usually in the first two to three days, then tapers off. If your sore throat lingers beyond a week, that’s worth a call to your doctor, since it may point to a bacterial infection, LPR, or another condition that needs specific treatment.
With strep throat, most people start feeling noticeably better within 24 to 48 hours of starting antibiotics, though you should finish the entire course.
Signs That Need Prompt Attention
Most sore throats are uncomfortable but harmless. A few warning signs, however, suggest something more serious is going on:
- Difficulty breathing or swallowing requires emergency care. This can indicate severe swelling or an abscess forming near the tonsils.
- Fever above 103°F (39.4°C) points to a more aggressive infection.
- Pus on the back of the throat or blood in your saliva warrants a same-day visit.
- Hoarseness lasting more than a week could signal LPR, vocal cord issues, or rarely something more concerning.
- A skin rash alongside a sore throat can indicate scarlet fever (a strep complication) or other systemic infections.
A sore throat that keeps coming back every few weeks, even if each episode is mild, is also worth investigating. Recurrent episodes can point to LPR, chronic tonsillitis, or environmental irritants you haven’t identified yet.