Ibn Qayyim in "Medicine of the Prophet" said, “There are many types of headaches that result from various conditions. Headaches usually start when the head becomes hot due to the pressure of a septic vapor that accumulates near the head and which seeks a way out of the body but fails. Then, the pressure of the vapor intensifies, just as a pot when it is heated but the steam is not able to escape from it. It is a fact that when moisture heats up, it seeks more space to expand. Similarly, the vapor accumulates near the head and then causes a headache in the entire head because it is unable to expand or escape from the body as it heats up. This condition causes a type of dizziness. There are various specific causes for headaches.”