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).
The following causes of Scalp tenderness are ones for which we do not have any prevalence information. 1  Basal cell carcinoma. 2  Brain tumour. 3  Cellulitis. 4  Cervical myelopathy. 5  Contact dermatitis. 6  Head lice. 7  Malignancy. 8  Migraine. 9  Scalp injury. 10  Squamous cell carcinoma. 11  Tension headache. 12  Tick bite. 13  more causes...Â».