One-sided throat pain usually means something localized is going on, rather than a widespread infection like a cold. When both sides hurt, it’s typically a general viral illness. When only one side hurts, the cause is often concentrated in a specific structure: a single tonsil, a swollen lymph node, a dental problem, or an irritated nerve. Most causes are minor and resolve on their own, but a few need prompt attention.
Tonsillitis on One Side
Your tonsils can become infected independently of each other. A bacterial or viral infection that takes hold in just one tonsil will cause pain, redness, and swelling limited to that side. You might notice it hurts more when you swallow, and the pain stays firmly on one side rather than spreading across your throat. Strep throat, while it usually affects both sides, can occasionally hit one tonsil harder than the other, creating a lopsided feeling.
Peritonsillar Abscess
If one-sided throat pain is getting worse rather than better, especially after a few days of a sore throat, a peritonsillar abscess is a possibility. This is a pocket of pus that forms in the tissue next to a tonsil, almost always on just one side. The hallmark signs include significant swelling that pushes the affected tonsil toward the middle of your throat and shifts the uvula (the small dangling tissue at the back) away from the painful side. That uvula shift shows up in roughly half of cases.
Nearly everyone with a peritonsillar abscess has some degree of difficulty opening their mouth fully, because the infection inflames muscles involved in jaw movement. The pain is usually severe, and you may find it very hard to swallow or notice your voice sounds muffled, sometimes called a “hot potato” voice. This condition needs medical treatment to drain the abscess and clear the infection.
A Swollen Lymph Node
You have chains of lymph nodes running down both sides of your neck, and when one side fights off an infection, the nodes on that side can swell and become tender. A single enlarged lymph node near the angle of your jaw can create a deep, aching sensation that feels like throat pain. The most common trigger is an upper respiratory infection like a cold or strep throat. You can often feel the swollen node as a tender, bean-sized lump just below your jawline. It signals your immune system is actively working on something nearby, and it typically shrinks back down within a couple of weeks as the underlying infection clears.
Postnasal Drip on One Side
If one side of your nose is more congested than the other, whether from a sinus infection, allergies, or a deviated septum, mucus can drain down the back of your throat unevenly. That constant trickle irritates the throat lining on the affected side, especially overnight. You might notice the pain is worst in the morning and improves somewhat during the day. Treating the underlying congestion or allergies usually resolves the throat discomfort.
Wisdom Teeth and Dental Problems
An impacted or partially erupted wisdom tooth can cause pain that radiates into the throat on the same side. When a wisdom tooth doesn’t fully break through the gum, the surrounding tissue becomes difficult to clean properly. Bacteria build up, the gum becomes inflamed, and in more serious cases a dental abscess can form. As infection and inflammation spread from the back of the jaw, they produce what’s called “referred pain,” which you feel in your throat even though the source is your tooth. If your one-sided throat pain comes with jaw soreness, swelling near your back molars, or a bad taste in your mouth, a dental issue is worth investigating.
Glossopharyngeal Neuralgia
This is a less common but very distinctive cause of one-sided throat pain. Glossopharyngeal neuralgia involves a nerve that serves the back of the tongue, the tonsil area, and the region near the ear. The pain is sharp, stabbing, or electric shock-like, and it strikes on one side only. Episodes last anywhere from a few seconds to about two minutes, then stop abruptly. Between attacks, you may feel completely fine or have a lingering mild ache.
The triggers are very specific: swallowing, talking, coughing, or yawning can set off an attack. Both hot and cold drinks can make it worse. If you’re experiencing brief but severe jolts of pain in your throat that seem to fire and then disappear, this condition is worth bringing up with a doctor. It’s rare, but it’s treatable once identified.
Eagle Syndrome
Beneath each ear, you have a small, pointed bone called the styloid process. It’s normally about an inch long. In some people, this bone grows longer than usual (over 3 centimeters) or the ligament connecting it to the front of the neck hardens into bone. When these structures press on nearby nerves, particularly the same nerve involved in glossopharyngeal neuralgia, the result is sharp or shooting pain near the tonsils or the base of the tongue that can radiate to the ear.
Interestingly, most people with Eagle syndrome have an elongated styloid process on both sides, but the majority only feel pain on one side. The pain can mimic many other conditions, which is why Eagle syndrome often goes undiagnosed for a while. It’s typically identified through imaging after other causes have been ruled out.
Vocal Cord Lesions
Growths on the vocal cords, such as polyps, nodules, or cysts, can cause a general neck pain or a shooting pain that travels from ear to ear. If the lesion sits on one side, the discomfort may feel one-sided as well. You’d likely also notice voice changes: hoarseness, a breathy quality, or pain when talking or singing. A doctor can examine the vocal cords directly using a thin scope passed through the nose or mouth.
When One-Sided Throat Pain Needs Urgent Care
Most one-sided sore throats improve within a week. Certain symptoms, however, signal something more serious. Seek emergency care if you have difficulty breathing or cannot swallow at all. See a doctor promptly if your sore throat lasts longer than a week, you develop a fever above 103°F (39.4°C), you see pus at the back of your throat, you notice blood in your saliva or phlegm, you develop a skin rash, or you show signs of dehydration. A voice that stays hoarse for more than a week also warrants a visit.
One-sided pain that keeps getting worse over several days, especially with increasing difficulty opening your mouth or a muffled voice, suggests a possible abscess and shouldn’t wait for a scheduled appointment.