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).
Neurologic Causes. Headaches can cause scalp pain and sensitivity. With tension headaches, you may feel like a there is a tight band around your head. With chronic migraines, your scalp may be unusually sensitive to touch, causing pain with even gentle brushing. Headache from a condition known as temporal arteritis can involve the scalp. It is a medical emergency that may lead to vision loss. Symptoms include head pain at the temples and visual disturbance.