Pain in Jaw When Opening Mouth: Causes and Gentle Care

Pain in the jaw when opening the mouth is common, and most of the time it comes from the jaw joint and the muscles you chew with. They may be tired, tight or a little irritated. Less often, the cause is a tooth, the ear or the sinuses. Knowing which is more likely helps you choose what to do next.

You can feel the joint yourself. Rest a fingertip just in front of each ear, then let your mouth fall open slowly. The small bump that moves under your finger is the temporomandibular joint, often called the TMJ. It glides forward a little each time you open. If that glide is sore, or a muscle around it keeps holding on, opening can ache, click or catch.

Why there is pain in the jaw when opening the mouth

The most common reason is temporomandibular disorder, or TMD. This is a broad name for trouble in the jaw joint and the chewing muscles. The NHS page on temporomandibular disorder lists difficulty opening your mouth fully, and the jaw locking as you open it, among its signs. Clicking, popping and an ache near the ear are part of the picture for many people too.

Several everyday things can leave the jaw sore as it opens.

Clenching or grinding. Many people press the back teeth together while they focus or worry. Some grind at night and wake with a heavy, tired face. Muscles that have gripped for hours often complain when you then ask the mouth to open.

A long dental visit or a big yawn. An hour in the dental chair with the mouth held wide asks a lot of the joint. One very wide yawn can do something similar in a second. The soreness often shows up the next time you bite into something.

Tough or chewy food. A crusty baguette, a tough steak or an afternoon of gum all keep the chewing muscles busy. Afterwards, opening wide may feel stiff and slow.

Stress. The jaw is one of the places where worry tends to settle. You might notice it tighten during a hard phone call or in heavy traffic. Over weeks, that quiet gripping can make every opening feel like effort.

Headaches often travel with a busy jaw. Some of the chewing muscles fan out over the temples, so a clenched jaw can show up as an ache at the sides of the head. Headaches are already very common: about 40% of people around the world live with a headache disorder (WHO, 2025). If yours sit around the temples and arrive along with a sore jaw, the two may be linked.

Other causes of jaw pain when opening your mouth

Not every sore jaw is TMD. Sometimes the pain starts somewhere close by and is felt in the jaw.

Teeth. A tooth infection, a cracked tooth, or wisdom teeth coming through can all hurt more as the mouth opens. Signs that point this way include pain on biting in one spot, a bad taste, a swollen gum, or a tooth that reacts to hot and cold.

Ears and sinuses. The jaw joint sits right beside the ear canal. An ear infection can make opening uncomfortable, and so can blocked, swollen sinuses after a cold. Pressure in the cheeks or a full feeling in the ear are useful clues.

If you are unsure where the pain is coming from, a dentist can usually help tell these apart. If you are wondering how long TMD tends to stay once it starts, our guide on how long temporomandibular joint disorder lasts looks at that question in more depth.

Gentle ways to ease a jaw that hurts to open

None of these is a cure. They give a sore jaw less to do while it settles.

Choose soft foods for a while. Soup, porridge, eggs, fish and well cooked vegetables let you eat without opening wide. Cut food small so each bite stays modest.

Keep yawns small. When a yawn comes, rest the back of a hand lightly under your chin. Let the yawn happen, only with less width.

Notice the tongue and teeth. At rest, the back teeth usually do not touch. The tongue lies soft on the floor of the mouth. Check in a few times a day: are your teeth pressed together, and where is your tongue? Then let a small space appear between the teeth.

Try warmth. A warm cloth over the side of the face can feel soothing, especially in the evening.

Move small and easy. Sitting comfortably, let your mouth open just a little, far less than full, then close without biting down. Do this slowly a few times. You can also let the lower jaw drift a tiny way to one side and back. Stay well inside comfort. If anything sharpens the pain, make the movement smaller or rest.

Include the head and neck. The jaw does not move alone. Turn your head slowly to look over one shoulder, and notice what your jaw does on the way. Does it stay soft, or does it tighten? Then nod gently, and feel whether the mouth wants to part slightly as the chin lowers. Sensing these links often lets the jaw feel less guarded.

For more on letting the face soften, see our guide on how to relax your jaw. If slow noticing is new to you, somatic exercises for beginners offer a calm way to learn it in other parts of the body first.

Learning an easier way to open

The Feldenkrais® Method is a way of learning through slow, attentive movement. Instead of pushing the jaw to open further, it asks how the opening is organised. In a lesson, you might sense how the jaw, tongue, eyes and neck take part as you turn your head. The movements are small, with rests in between, and you never go into pain.

The aim is to help the nervous system, the body's wiring for movement, find a less effortful way to open and close. Many people discover that the jaw grips because the neck or the breath is holding too. When those ease, the mouth often opens with less fuss. Our Feldypedia entry on jaw tension and TMJ explains how stress tends to gather in this area.

Feldy brings lessons like these into short audio sessions you can follow at home. You can explore the body awareness program, or start a free trial whenever it suits you.

Alongside clinical care and other methods

Slow, attentive movement sits alongside what a dentist or doctor offers, and it never takes the place of that care. A dentist can look at your teeth, your bite and signs of grinding, and may suggest a mouth guard to wear at night. A doctor can check the ears and sinuses, and offer pain relief if you need it. A physiotherapist who works with jaws can also be part of your care.

Other approaches each have their own logic. A clinician may teach you jaw exercises that build steadier control, or more room to open. Massage of the chewing muscles can ease soreness for a while. Yoga and slow breathing practice help some people feel calmer, which may in turn soften clenching. Each follows its own route, and you may find more than one useful.

When to see a dentist or doctor

Book a visit with a dentist or doctor when:

• the jaw gets stuck open or stuck closed (if it is stuck open, get help the same day)
• there is swelling in the face, jaw or gum
• you have a fever
• the pain followed a fall or a blow to the face
• you feel numbness in the face, lips or chin
• the pain lasts more than a couple of weeks, or keeps getting worse

Call emergency services straight away if jaw pain comes with chest pain, breathlessness, sweating or feeling sick. These can be signs of a heart problem and need urgent help.

Common Questions about pain in the jaw when opening the mouth (FAQ)

Is pain when I open my mouth a sign of TMJ?

Often, yes. Many people call it TMJ, after the jaw joint itself. The fuller name is temporomandibular disorder, or TMD, and it covers the joint and the chewing muscles. A sore tooth, wisdom teeth, or an ear or sinus problem can feel similar, so a dentist can help tell them apart.

Will jaw pain when opening my mouth go away on its own?

Very often it does. When the jaw is simply tired, from a long dental visit, tough food or a tense week, it tends to ease once it gets some rest. If a habit like clenching carries on, the ache may keep returning until that habit quietens.

How long does jaw pain when opening the mouth last?

A short flare may ease within days or a couple of weeks. When stress or grinding keeps feeding it, it can come and go for longer. If it has not eased after about two weeks, or it keeps getting worse, ask a dentist or doctor to take a look.

What is the best sleeping position for jaw pain?

Many people find lying on the back the easiest, because nothing presses on the face. If you sleep on your side, a soft pillow that supports the head without pushing the jaw sideways can help. Try not to sleep with a hand or arm tucked under your chin.

What should I avoid when my jaw hurts to open?

For a while, leave aside gum, hard sweets, crusty bread and very chewy meat. Take small bites instead of wide ones. Keep yawns small by resting a hand under the chin. Avoid opening wide again and again to test how far the jaw goes.

When should I see a dentist or doctor about pain opening my mouth?

Go soon if your jaw locks open or closed, if there is swelling or a fever, or if the pain follows a blow to the face. Numbness, or pain lasting more than a couple of weeks, also needs a check. Jaw pain with chest pain or breathlessness is an emergency, so call for help straight away.

How is gentle movement different from jaw stretching or a mouth guard?

A mouth guard is a fitted piece a dentist may offer if you grind at night. Jaw stretching usually aims to widen how far the mouth opens. Gentle movement asks the jaw to do less, and to move easily with the head and neck. These can sit side by side.