What could cause a headache on one side of my head and eye, and how can it be relieved?

Recurring headaches on one side of the head with pain behind the eye may indicate cluster headaches, a type of primary headache disorder known for intense, one-sided pain around the eye. However, if the headache and eye pain are new, sudden, and severe, acute angle-closure glaucoma should be considered—this is a medical emergency that requires immediate treatment to prevent permanent vision loss. Other possible causes include migraines, sinus infections, or trigeminal neuralgia. Because treatment varies significantly based on the underlying cause, an accurate diagnosis from a healthcare professional is essential.

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Reviewed for medical accuracy: 07/15/2026