The Mayo Clinic states that most sinus infections do not present any present danger and are typically treated with over-the-counter drugs and antibiotics. Around 31 million people in the United States suffer from chronic sinusitis, according to the National Institute of Allergy and Infectious Diseases. Sinus infections are considered "chronic" when they last longer than eight weeks, according to the Mayo Clinic. Most signs and symptoms of a chronic serious sinus infection are similar to an acute sinus infection except that they last much longer. A serious sinus infection will manifest itself in various signs and symptoms such as severe sinus pressure and pain, nasal congestion, swelling, and a fever.
Sinus Pain and Pressure
The University of Maryland Medical Clinic describes a sinus headache as a dull, throbbing pain in the center of the head. Sinus pain and pressure may be felt behind the eye, making the eye tender to touch. The pressure behind the eyes can produce floaters in a person's vision and make him feel tired. Patients also commonly feel this pressure in the inner ear, forehead and back of the neck. Some people experience a toothache, because the sinus cavity can press on the roots of the upper teeth.
Nasal Congestion
Severe nasal congestion is a common sign of a chronic serious sinus infection. Nasal congestion is due to the swelling and inflammation of the sinus cavity. The swelling obstructs a person's ability to drain mucus properly and restricts air flow through the nostrils. Nasal congestion may also manifest itself as a runny nose or postnasal drip. Postnasal drip is the constant dripping of excess mucus in the back of the throat, which can cause coughing, a sore throat and a sour stomach. Nasal congestion may lead to difficulty in smelling and tasting.
Swelling
Facial swelling is a sign of serious chronic sinus infection. The Mayo Clinic recommends a person to see a doctor immediately if he develops swelling around the eyes or around the forehead as it can be a sign of a more serious condition. Swelling around the eyes may be the result of severe seasonal allergies and should be assessed by a doctor to determine the cause of the swelling.
Fever
It is common to develop a low-grade fever with a sinus infection, but for a fever higher than 100.5 degrees, the Mayo Clinic encourages seeking medical advice.
