Most sinus infections are caused initially by a virus or allergies. Swelling and mucous build up prevent the sinus from properly draining. Pressure increases inside the sinus causing pain. You can start with a decongestant, either orally or by nasal spray. If you think it is an allergy, you can take an antihistamine as well. If the symptoms are not improving over 2 - 3 days, contact your doctor. Call sooner if the pain is getting worse or you develop a fever.
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