Cluster headache is unilateral and associated with pain behind the eyes, running nose, and watering from the eyes. It is a rare form of a headache, and recurrence is characteristic. The pain occurs periodically at a specific time of the day, generally in the early morning. The pain is severe and lasts for 30-90 minutes. Patients may remain asymptomatic for weeks or months before another headache (cluster) occurs.
Headache at the back of the head - Causes, and Management
Headaches can range in severity and discomfort at the back of the head and can be caused by a variety of factors. Read the article below to learn more.
Cluster Headaches - Symptoms, Triggers, Management, and Modes of Prevention
Cluster headaches are excruciatingly severe headache episodes that come and go in repeating cycles throughout the year with periods of remissions in between.

Chronic Headaches - Causes, Types, Diagnosis, and Treatment
Chronic headaches are daily headaches that may last about fifteen days a month. Migraines, cluster headaches, and tension headaches are a few of them.