Headache is a common condition that causes pain or discomfort in the head, scalp or neck. It can range from mild to severe and may feel like a dull ache, sharp pain or throbbing sensation. Headaches can be caused by stress, lack of sleep, dehydration, eye strain or underlying health conditions. There are different types of headaches, such as tension headaches, migraines & cluster headaches, each with its own symptoms. While most headaches are not serious and go away with rest, frequent or severe headaches should be evaluated by a doctor. Proper diagnosis & treatment can help manage the pain and prevent future issues.