A headache is a common medical condition characterized by pain in the head, scalp, or neck. It can range from mild to severe and manifest as a dull ache, throbbing, or sharp pain. Headaches are broadly categorized into primary headaches, such as tension headaches, migraines, and cluster headaches, and secondary headaches, which are symptoms of an underlying condition. Management depends on the type and severity, often involving pain relievers, rest, and identification and avoidance of triggers.