Post-nasal drip, coughing, fever, nasal stuffiness and discolored nasal charge are symptoms of severe nasal congestion, claims the American College of Allergy, Asthma and Immunology. Severe sinus congestion is known as chronic sinusitis when the symptoms last over eight weeks.
Other symptoms of severe sinus congestion include ear pain, upper jaw and teeth aching, nausea, fatigue, and sore throat, according to Mayo Clinic. Reduced sense of smell and taste, and pain and tenderness around the facial extremities are also symptoms.
Sinusitis is treated with antibiotics, nasal decongestants, antihistamines and topical nasal corticosteroids, says the American College of Allergy, Asthma and Immunology. If drugs fail to treat severe sinus congestion, then surgery of the nasal passages may be required.