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 enables us to feel itching, tingling and tightness, especially on the scalp, which is rich in nerve endings. These symptoms can be an indication of a scalp disease (hair loss, dandruff condition, dermatosis). However, when these symptoms appear in an isolated manner, they are defined as sensitive scalp.