In medicine a headache or 's a symptom of a number of different conditions of the head and sometimes neck. Some of the causes are benign while others are medical emergencies. It ranks among the most common pain complaints. There're a number of different classification systems for headaches. The most well-recognized's that of the International Headache Society. Treatment of a headache depends on the underlying etiology or cause, but commonly involves analgesics. Classification The classification… (More on Headache)