When your sinuses become clogged, sinus headaches -- a feeling of deep pain and pressure above your nose and between your eyes -- can follow. Sinus headaches can range from annoying to severe, and they can sometimes be hard to treat.
But that’s not only because the underlying sinus problem can be hard to resolve. Sometimes, the problem is that people who think they have sinus headaches don’t really have them. Instead, they, or their doctors, mistake tension or migraine headaches for sinus headaches...
Don't take decongestants unless your doctor tells you otherwise. They may increase blood pressure. They also may keep some high blood pressure drugs from working the way they should.
Watch out for combination medications for allergies that include decongestant ingredients. That includes allergy drugs as well as many remedies for cold, flu, and sinus problems. A pharmacist can check the ingredients for you.
American Heart Association: "Over-the-Counter Medications."
Harvard Medical School: "Don't Let Decongestants Squeeze Your Heart."
UpToDate: "Definition, risk factors, and evaluation of resistant hypertension," "Diphenhydramine."