Persistent jaw pain is most commonly caused by a group of conditions called temporomandibular disorders, or TMD, which affect about 5% of U.S. adults. But “always hurting” can also stem from nighttime teeth grinding, muscle tension you’re not aware of, or habits that strain the joint throughout the day. In some cases, ongoing jaw pain points to something unrelated to the jaw itself.
TMD: The Most Common Cause
The temporomandibular joints sit just in front of your ears and connect your jawbone to your skull. When something goes wrong with these joints, the surrounding muscles, or the disc of cartilage inside them, the result is TMD. Pain can show up as a dull ache along your jaw, sharp pain when chewing, or soreness that radiates into your face, neck, or temples. You might also notice clicking, popping, or a jaw that occasionally locks open or shut.
TMD is at least twice as common in women as in men. A 2020 national survey of over 52,000 U.S. adults found that 6.2% of women reported jaw or face pain lasting at least a day in the previous three months, compared to 3.2% of men. Researchers aren’t entirely sure why the gap exists, though hormonal differences and variations in pain processing are likely involved.
One important finding: despite years of belief that a “bad bite” causes TMD, the National Institute of Dental and Craniofacial Research states there is no evidence that misaligned teeth are a cause. This matters because some providers still recommend grinding down teeth, placing crowns, or orthodontic treatment to fix a bite problem that isn’t actually driving the pain. Experts strongly recommend avoiding any treatment that permanently changes your teeth, bite, or jaw joints, since the evidence for these approaches is lacking and they can make things worse.
Muscle Tension and Trigger Points
Your jaw is powered by some of the strongest muscles in your body, particularly the masseter (the thick muscle you can feel bulging when you clench) and the temporalis (the fan-shaped muscle along the side of your head). When these muscles develop tight, hypersensitive bands called trigger points, they generate a constant deep ache that can feel like the pain is coming from the joint itself.
What makes muscle-based jaw pain so persistent is a cycle called central sensitization. When a jaw muscle stays irritated long enough, your nervous system starts amplifying pain signals. Pain that once only appeared during chewing begins showing up at rest. The muscles that work alongside the irritated one get overloaded and develop their own trigger points, spreading the problem. This is why jaw pain that starts on one side can eventually involve both sides, the temples, or even the neck.
Teeth Grinding You May Not Know About
Bruxism, or teeth grinding and clenching, is one of the sneakiest contributors to chronic jaw pain because it often happens during sleep. You can grind for years without realizing it. The signs tend to be indirect: waking up with a tired or tight jaw, morning headaches, tooth sensitivity, or flat and worn-down teeth your dentist notices during a checkup.
Nighttime clenching generates enormous force on the jaw joints and muscles for hours at a time. Over weeks and months, this leads to inflammation in the joint, chronic muscle fatigue, and the clicking or locking that many people associate with TMD. Stress and anxiety are major drivers of bruxism, which is why jaw pain often worsens during high-pressure periods at work or during life changes.
Posture and Daily Habits
If you spend hours at a desk or looking at a phone, your head tends to drift forward of your shoulders. This forward head posture puts extra strain on your neck muscles, which are directly connected to the muscles that control your jaw. Over time, the added tension causes inflammation in and around the temporomandibular joint. People who notice their jaw pain is worse by the end of a workday are often dealing with posture-related strain.
Other daily habits that quietly fuel jaw pain include:
- Resting your chin on your hand while sitting at a desk, which pushes the jaw to one side
- Chewing gum frequently, which fatigues the jaw muscles the same way doing hundreds of bicep curls would fatigue your arm
- Holding your phone between your ear and shoulder, which tenses the neck and jaw on one side
- Clenching during concentration, a daytime version of bruxism that many people do without noticing while driving, exercising, or staring at a screen
Arthritis in the Jaw Joint
The temporomandibular joint is a true joint with cartilage, fluid, and bone surfaces, which means it can develop arthritis just like a knee or hip. Osteoarthritis wears down the cartilage inside the joint over time, causing a gritty or crunching sensation when you open your mouth. Rheumatoid arthritis, an autoimmune condition, can also target the jaw. People who have arthritis in the jaw often have the same type of arthritis in other joints, so if your hands, knees, or other joints are also stiff or swollen, the jaw pain may be part of a larger pattern rather than a standalone problem.
When Jaw Pain Isn’t About the Jaw
Jaw pain can occasionally signal something more serious. The American Heart Association lists jaw pain as one of the warning signs of a heart attack, particularly when it appears alongside chest discomfort, shortness of breath, or pain in the arms, back, neck, or stomach. This type of jaw pain tends to come on suddenly rather than building over weeks, and it feels different from the familiar ache of a sore muscle. If jaw pain is new, unexplained, and accompanied by any of those other symptoms, treat it as an emergency.
Sinus infections can also cause pain that mimics jaw problems, because the roots of your upper teeth sit very close to the sinus cavities. An abscessed tooth is another common mimic. Pain from an infection tends to be throbbing and localized to one area rather than the broad, bilateral ache typical of TMD.
What Actually Helps
Because TMD has so many contributing factors, there’s no single fix. But the most effective starting point is conservative, reversible treatment. That means approaches you can try without permanently altering your teeth or jaw.
Jaw exercises have the strongest evidence for reducing pain and improving mobility. Coordination exercises, which train the muscles on both sides of your jaw to work together smoothly, appear to be the most effective for both muscle-based and joint-based TMD pain. Stretching exercises and resistance exercises (gently opening your mouth against the pressure of your hand) also show positive effects on pain relief and range of motion. A physical therapist who specializes in the jaw can teach you a targeted routine in one or two sessions.
Oral splints or night guards are commonly prescribed, and they can help by reducing the load on your jaw joints and making you more aware of clenching. However, the evidence for splints alone is surprisingly weak. Studies have not demonstrated that splints reduce pain more than basic education and jaw exercises do. They tend to work best as one piece of a broader approach rather than a standalone solution. If you have multiple overlapping conditions like anxiety, migraines, or widespread pain conditions, a splint alone is especially unlikely to be enough.
Soft food during flare-ups gives inflamed muscles and joints time to calm down. Moist heat (a warm washcloth for 15 to 20 minutes) increases blood flow and loosens tight muscles. Cold packs work better for acute inflammation or swelling. Many people alternate between the two.
Addressing the habits behind the pain matters as much as treating the symptoms. Checking in with your jaw position throughout the day is a simple technique: your teeth should be slightly apart and your jaw relaxed when your mouth is closed. If you catch yourself clenching, gently place your tongue on the roof of your mouth behind your front teeth. This position makes it nearly impossible to clench and retrains your resting posture over time. Improving your desk ergonomics so your screen is at eye level, and your head stays over your shoulders rather than jutting forward, reduces the postural strain that feeds into jaw tension.