One-sided jaw pain most often comes from a problem with the temporomandibular joint (TMJ), the hinge that connects your jawbone to your skull on each side of your face. But it can also stem from a dental infection, a nerve condition, a blocked salivary gland, or even referred pain from your sinuses. The cause usually becomes clear once you pay attention to what triggers the pain, how long it lasts, and what other symptoms come with it.
TMJ Disorders: The Most Common Cause
You have two temporomandibular joints, one on each side. A problem with just one of them is enough to cause pain on that side only. TMJ disorders (sometimes called TMD) affect the joint itself, the small disc of cartilage inside it, or the muscles that control jaw movement. The exact cause is often unclear, but a combination of genetics, stress, pain sensitivity, and muscle coordination issues all seem to play a role. Women develop TMJ disorders more frequently than men, and researchers suspect structural differences in the joint may be part of the reason.
The hallmark symptoms are pain or tenderness in the jaw, clicking or popping sounds when you open your mouth, and sometimes a grating sensation while chewing. That clicking sound happens when the disc inside the joint slips out of position and then snaps back as you open wide. If the disc stops snapping back into place, the clicking may actually disappear, but you’ll notice something worse: reduced mouth opening or a feeling that your jaw is locked shut.
One common misconception is that a bad bite or braces cause TMJ problems. Research does not support this. TMJ disorders also tend to show up alongside other conditions like headaches, back pain, sleep problems, and irritable bowel syndrome, which suggests they share overlapping mechanisms related to how the body processes pain and stress.
Tooth Infections and Dental Problems
A tooth abscess, which is a pocket of infection at the root of a tooth, produces severe, constant, throbbing pain that can radiate into the jawbone, neck, or ear on the affected side. The pain typically gets worse with hot or cold foods and when you bite down. You may also notice swelling in your face or cheek, and the lymph nodes under your jaw can become tender and swollen. Unlike TMJ pain, which tends to center around the joint near your ear, abscess pain usually feels deepest near the problem tooth and throbs even when you’re not moving your jaw.
Impacted wisdom teeth are another frequent culprit, especially in younger adults. As these teeth push against surrounding bone or crowd neighboring teeth, they create a dull ache along the back of the jaw on one side. The gum tissue over a partially erupted wisdom tooth can also trap bacteria and become inflamed, adding sharp pain on top of the pressure.
Nerve Pain: Trigeminal Neuralgia
If your jaw pain feels like a sudden electric shock, stabbing, or shooting sensation rather than a dull ache, the trigeminal nerve may be involved. Trigeminal neuralgia causes intense flashes of pain in the face that can be triggered by things that shouldn’t hurt at all: a light touch while washing your face, brushing your teeth, eating, drinking, talking, or even a gust of cold air. The pain is almost always on one side and tends to come in brief, severe bursts rather than a constant throb. This condition is far less common than TMJ problems or dental issues, but its distinct pattern makes it recognizable.
Sinus Infections
Your maxillary sinuses sit directly above your upper jaw on each side. When one of them gets congested or infected, the pressure can radiate into the upper teeth and jaw, mimicking a toothache. The key difference is that sinus-related jaw pain usually comes with nasal congestion, a feeling of fullness or pressure in the cheek area, and sometimes a headache across the forehead. Bending forward tends to make the pressure worse. If your jaw pain started around the same time as cold symptoms or allergies, a sinus issue is worth considering.
Salivary Gland Stones
A less obvious cause of one-sided jaw pain is a salivary gland stone, a small mineral deposit that blocks one of the ducts under your jaw. The telltale sign is pain and swelling that flare up during meals and then gradually fade between them. Eating stimulates saliva production, and when the duct is blocked, the gland swells with fluid it can’t release. You might notice a tender lump under your jaw on the affected side. In more severe cases, the area can become infected, causing fever, pus, and difficulty opening your mouth.
Jaw Pain as a Heart Attack Warning
Jaw pain, particularly along the lower left jaw, can occasionally signal a heart attack. This is more common in women, who are more likely than men to experience heart attack symptoms beyond classic chest pain. The American Heart Association lists jaw pain alongside discomfort in the arms, back, neck, and stomach as potential warning signs. Heart-related jaw pain typically comes with other symptoms: a cold sweat, nausea, lightheadedness, shortness of breath, or unusual fatigue. If your jaw pain came on suddenly alongside any of these, treat it as an emergency.
How to Tell These Apart
The pattern of your pain offers the strongest clue to its source:
- Worse when chewing or yawning, with clicking sounds: TMJ disorder
- Constant throbbing near a specific tooth, worse with temperature: dental infection
- Brief electric shock triggered by light touch: trigeminal neuralgia
- Pressure in jaw and cheek with nasal congestion: sinus infection
- Swelling under the jaw that flares during meals: salivary gland stone
- Sudden onset with sweating, nausea, or arm pain: possible cardiac event
Managing TMJ Pain at Home
Since TMJ problems are by far the most common cause of one-sided jaw pain, they’re worth addressing first. Over-the-counter anti-inflammatory pain relievers can reduce joint inflammation and ease discomfort. Topical anti-inflammatory gels applied to the skin over the joint can also help, with some studies showing benefit from applying them several times a day.
Beyond medication, simple habits make a real difference. Avoid chewing gum, biting your nails, or clenching your teeth during the day. Soft foods give the joint a chance to calm down. Applying a warm compress to the side of your face for 15 to 20 minutes can relax the muscles around the joint, while a cold pack helps if there’s active swelling.
Jaw exercises, particularly coordination exercises that train the muscles on both sides to work together smoothly, have shown meaningful results for both pain relief and improved range of motion in clinical studies. A simple starting exercise: place your tongue on the roof of your mouth and slowly open and close your jaw, keeping the movement controlled and symmetrical. Physical therapy that includes guided versions of these exercises is one of the most effective conservative treatments available for painful TMJ conditions.
Stress management matters too. Clenching and grinding, often unconscious, are major drivers of TMJ flare-ups. If you wake up with jaw soreness, nighttime grinding is likely involved, and a dentist can fit you with a nightguard to reduce the strain on the joint while you sleep.
When the Pain Points to Something Else
TMJ pain that doesn’t improve after a few weeks of self-care deserves professional evaluation. The same goes for jaw pain accompanied by fever, visible swelling, difficulty swallowing, or numbness. Pain in the mouth, jaw, or face can overlap between several conditions, and your dentist or doctor may need to rule out other causes before landing on a diagnosis. If your pain is sharp, electric, and triggered by light touch, bring that up specifically, because trigeminal neuralgia requires different treatment than a joint or muscle problem.