Sinusitis is the inflammation of the tissue within the sinuses. Most cases of sinusitis are caused by a virus. Most cases go away on their own within a week. Symptoms include a stuffy nose, congestion and tenderness in the face. Your healthcare provider usually can diagnose acute sinusitis by noting your symptoms and examining your nose and face. A humidifier may help to alleviate congestion. Pain relievers can help reduce tenderness and a doctor may ...