 [ Symptoms ] can a sinus infection cause pain in the back of the skull i have had this infection for three to four weeks now due to the holidays i did not get to see a doctor until last week he said there was a sinus infection and some inflammation and prescribed an antibiotic and a steroid dose pack the pain is on the left side behind the ear it hurts sharply when i bend over or stretch forward at first i thought i pulled a muscle in my neck while working out doing shrugs but the pain will not go away gland inflammation or pulled muscle [ Disease ] i can not examine you so i have no way of confirming or disputing the diagnosis but there is a sinus mastoid sinus located behind both ears the bony prominence that you feel the mastoid sinus connects with the middle ear so usually there are ear related symptoms there are also lymph nodes in this area