A headache is a common condition characterized by pain or discomfort in the head, scalp, or neck. It can vary in intensity and duration, ranging from mild to severe. Headaches can be classified into different types, including tension headaches, migraines, and cluster headaches, each with distinct causes and symptoms. The causes of headaches can include stress, dehydration, lack of sleep, or underlying medical conditions. Treatment options often involve over-the-counter medications, lifestyle changes, and relaxation techniques. In some cases, persistent headaches may require consultation with a healthcare professional for further evaluation and management.