Cephalalgia, commonly known as a HEADACHE, is a medical condition characterized by pain in the head. It can be caused by a variety of factors, including stress, tension, allergies, and certain medications. Cephalalgia can range from mild to severe and can last for a few minutes or several days. Treatment options vary depending on the cause and severity of the HEADACHE, but may include over-the-counter medications, prescription medications, lifestyle changes, and relaxation techniques.