One of the main causes of sinus drainage is simply being alive. Every day the human body produces several liters of sinus fluid and mucus, and all of that natural liquid must go somewhere.
It is a area of tenderness of the scalp in which people also sometimes feel stabbing headaches. Others just feel very sore and tender to the touch. It is felt to be caused by irritation of the connective tissue which attaches the muscles of the scalp to the skull (cranium).
Many times, scalp and hair pain or tenderness is not serious and goes away on its own. However, if you have persistent scalp pain, hair loss, crusting or bleeding, see your doctor for further evaluation. In the meantime, here are some possible causes of your discomfort.