If you are experiencing symptoms of a sinus infection, call your health care provider as soon as possible, especially if you experience the following:
Symptoms lasting longer than 10 - 14 days or a cold that gets worse after 7 days.
Severe headache, unrelieved by over-the-counter pain medicine.
Your health care provider most likely won't be able to diagnose your symptoms without gathering your medical history, giving a physical examination, and possibly taking imaging studies or laboratory test. If left untreated, a sinus infection can spread and become something more serious, so it's important to be tested as soon as possible.