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).
This information refers to the general prevalence and incidence of these diseases, not to how likely they are to be the actual cause of Scalp tenderness. Of the 15 causes of Scalp tenderness that we have listed, we have the following prevalence/incidence information: 1  1 causes are very common diseases. 2  0 causes are common diseases. 3  3 causes are uncommon diseases. 4  0 causes are rare diseases. 5  1 causes are very rare diseases. 6  12 causes have no prevalence information.