severe sinus headaches
Sinus headaches can be caused by sinus congestion and inflammation, called sinusitis. Sinusitis, in turn, is caused by either a respiratory infection, such as a cold or flu, or allergies, like hay fever. Healthy sinuses allow mucus to drain and air to circulate throughout the nasal passages.
1 Most sinus infections are due to virals. 2  The main symptoms of a sinus headache are pain and tenderness over the affected area.  The pain from a sinus headache sometimes is worse in the morning due to mucous collection throughout the night.