Vitamin D deficiency and cluster headaches

Cluster headache is a distinct neurological disorder. Attacks are usually severe and focused around one eye or one side of the head, with features such as tearing, a blocked or runny nostril, eyelid swelling or restlessness on the same side. Vitamin D deficiency may coexist, but fatigue, low mood or generalised weakness are nonspecific and do not establish a cause for head pain.

A clinician distinguishes cluster headache from migraine, sinus disease, eye problems and other causes by asking about timing, duration, triggers, associated signs and the neurological examination. Keeping a headache diary can make this pattern easier to recognise.

Book an appointment if attacks recur, disturb sleep, or lead you to use pain medicines often. Record when each attack starts, how long it lasts, which side is affected, eye or nose changes, possible triggers and medicines taken. If blood testing confirms vitamin D deficiency, follow the prescribed replacement plan, but do not expect supplements to replace a cluster-headache treatment plan.

Seek emergency help for a sudden thunderclap headache, new weakness or numbness, trouble speaking, fainting, confusion, seizure, fever with a stiff neck, or a severe headache after a head injury. Urgent assessment is also needed for a new headache with vision loss or a painful red eye.

Ask whether your pattern fits cluster headache, whether an eye or neurological examination is needed, and which acute and preventive treatments are suitable. Ask whether vitamin D testing is relevant to your wider symptoms and how any deficiency should be corrected safely.