What could be the cause of a headache and swollen eyelid on one side?

Reviewed by Yoshinori Abe, MD

Internal Medicine

A headache with a swollen eyelid on one side may indicate several possible conditions, including a cervicogenic headache, cluster headache, sinus infection, preseptal or orbital cellulitis, or allergic reaction. These symptoms can also point to eye-related issues such as conjunctivitis, a stye, or blepharitis. Because causes range from mild to serious, identifying the underlying issue early is important.

To better understand what may be causing your symptoms and determine the right next steps, take a free, instant, online symptom check. It only takes a few minutes, uses AI trained on peer-reviewed medical data, and provides personalized insights—helping you decide whether self-care, a doctor's visit, or urgent evaluation is needed.

Reviewed for medical accuracy: 07/15/2026

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Explanation

Headaches and a swollen eyelid on one side can be concerning. One possible cause is a cervicogenic headache, which is a type of headache that starts from the neck. This kind of headache can sometimes cause symptoms on one side of the head, including pain and swelling around the eye. Another possible reason for these symptoms could be related to eye conditions, such as those seen in some cases of pulmonary hypertension, where changes in blood pressure can affect the eyes.

Here are some possible explanations:

Cervicogenic Headache: This headache starts from issues in the neck and can cause pain on one side of the head. It might also lead to swelling around the eye.
Eye Conditions: Changes in eye health, like those related to blood pressure issues, can cause swelling and discomfort around the eye.

If you experience these symptoms, it is important to talk to a healthcare professional to understand the cause and get the right treatment. You can start by taking a free symptom checker assessment to help identify potential causes of your headache and eyelid swelling.

(References)

Hsu CC, Tsai SH, Wang JC, Kao HW, Hsu CW, Liu WH, & Chen SJ. (2019). Swollen and bloodshot eye following headache. The American journal of emergency medicine, 30415985.
Fredriksen TA, Hovdal H, & Sjaastad O. (1987). "Cervicogenic headache": clinical manifestation. Cephalalgia : an international journal of headache, 3607868.
Lewczuk N, Zdebik A, Bogusławska J, Turno-Kręcicka A, & Misiuk-Hojło M. (2019). Ocular manifestations of pulmonary hypertension. Survey of ophthalmology, 30849428.

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