What could be the connection between a toothache and a headache on one side of my head?

Reviewed by Yoshinori Abe, MD

Internal Medicine

A toothache and a one-sided headache often occur together and may share a common cause. Conditions like hemicrania continua (a persistent one-sided headache), cluster headaches, migraines, or trigeminal nerve irritation can trigger pain in both the head and teeth. Dental problems such as cavities, abscesses, TMJ disorders, or bruxism (teeth grinding) can also radiate pain upward, mimicking a headache. In some cases, atypical dental pain stems from nerve dysfunction rather than the tooth itself, making diagnosis tricky.

Because the causes vary widely—from dental to neurological—identifying the source quickly matters for effective treatment. Instead of guessing, take a free, instant, online symptom check to clarify what may be behind your pain and get guidance on the right next steps, whether that's seeing a dentist, a neurologist, or your primary care provider.

Reviewed for medical accuracy: 07/15/2026

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Explanation

A toothache and a headache on one side of your head might be connected through several possible conditions. One such condition is hemicrania continua, which is a type of headache that affects only one side of the head and can occur with dental issues. This condition may cause continuous pain and can sometimes be mistaken for dental pain.

Another possibility is atypical dental pain, which might not originate from the teeth themselves but rather from nerve-related issues. For example, problems in the brain, such as a pontine infarct, can present as dental pain. This means that even though the pain feels like it is coming from a tooth, it might actually be related to a nerve problem elsewhere in the body.

Lastly, issues with the jaw, known as mandibular dysfunction, can also lead to pain in the teeth and head. This dysfunction can cause symptoms like pain and discomfort in the jaw area, which might radiate to the head, leading to headaches.

If you experience these symptoms, it is important to consult a healthcare professional to determine the exact cause and receive appropriate treatment. To better understand what might be causing your symptoms, you can check your symptoms with a free AI-powered tool before your appointment.

(References)

Noma N, Kamo H, Shimizu K, Plaza-Villegas F, Oka S, & Imamura Y. (2012). Hemicrania continua in a patient with concomitant dental .... Journal of the American Dental Association (1939), 23024307.
Goel R, Kumar S, Panwar A, & Singh AB. (2015). Pontine Infarct Presenting with Atypical Dental Pain. The open dentistry journal, 26464604.
Magnusson T, & Enbom L. (1984). Signs and symptoms of mandibular dysfunction after .... Acta odontologica Scandinavica, 6591675.

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