Most people hear “endometriosis” and think of period pain. That is only part of the picture.

Endometriosis happens when tissue like the lining of the uterus grows outside the uterus. It can cause pelvic pain, painful sex, heavy periods, bloating, fatigue, and fertility problems. It can also affect the rest of the body. One of those effects is jaw pain. Doctors call this a temporomandibular disorder. It involves the jaw joint and the muscles you use to chew.

What does this pain feel like?

It is not always a sharp “ouch” in one spot. Many women notice:

-Aching in front of the ear, at the temples, or along the jaw

-Clicking, popping, or grinding when they open their mouth

-A jaw that locks or will not open all the way

-Pain when they chew, yawn, or talk for a long time

-Morning tightness, worn teeth, or a partner who hears them grind at night

-Headaches or “ear pain” even when the ear exam is normal

-Pain that flares around their period, or on the same side as their pelvic pain

None of these automatically means you have endometriosis. A cavity, an ear problem, arthritis, or stress-related grinding can feel the same. The point is this: if you already have endometriosis, jaw pain deserves a real look. It is not “just stress.”

Is tissue growing in the jaw?

Almost never. A few case reports describe endometriosis in the jaw or the bone near the temple. Those cases are extremely rare. They are not how this usually works. For most women, the jaw hurts because the whole pain system is on high alert—not because tissue has traveled to the face.

So what is the connection?

Think of four overlapping reasons. Your nervous system gets extra sensitive.
When pain lasts for months or years, the brain can start treating normal signals as danger. A tight chewing muscle or a click in the joint then feels much worse than it “should.” This also helps explain why endometriosis often comes with migraines, irritable bowel symptoms, or widespread muscle pain.

Hormones affect the jaw joint.
Endometriosis is fueled by estrogen. The jaw joint and the nerves of the face also respond to estrogen. That is one reason jaw problems are more common in women, and why they can change across the menstrual cycle.

Inflammation does not stay in the pelvis.
Endometriosis creates ongoing inflammation. Those signals can make other joints and muscles more irritable, including the jaw.

Pain makes you clench.
Chronic pain is exhausting. Many people grind at night, clench during a flare, or hold tension in the neck, shoulders, and pelvic floor at the same time. A 2023 study of women with endometriosis found a strong link between teeth clenching and jaw pain. Pelvic pain on one side often lined up with jaw pain on that same side.

What you can do

You do not need a rare-disease workup of your face as a first step. You do need both problems on the same page.

-Tell your gynecologist about jaw pain, clicking, locking, or temple headaches. Do not wait to be asked.

-Tell your dentist if you have painful periods, pain with sex, or known endometriosis.

-Ask about a night guard, physical therapy for the jaw and neck, or pelvic-floor physical therapy.

-Notice whether jaw pain flares with your period. That pattern is a useful clue.

-Get new or one-sided jaw pain checked. A tooth infection and TMD can feel similar, and a tooth infection needs care now.

Treatment that calms endometriosis—hormones, pain care, physical therapy, better sleep—can sometimes ease jaw symptoms too, because the whole system is less wound up. Surgery can help the right person, but jaw pain may not vanish just because pelvic lesions are removed. That does not mean the pain is “in your head.” It means the nervous system may still need its own care.

Questions for your next visit

-Does my jaw pain change with my cycle?

-Is it on the same side as my pelvic pain?

-Do I clench or grind, especially on high-pain days?

-Can my gynecologist and dentist talk to each other about this?

The bottom line

Endometriosis is not only a pelvic disease. For many women, it is a whole-body pain condition. Jaw pain is one of the places that pain can land. You are not being dramatic. You are not “just stressed.” And you should not have to wait years for someone to connect the two.

Say it out loud at your next appointment: “I have endometriosis, and my jaw hurts too.” That one sentence can change the plan.

May 2026.