Majority of cases in adults and children are of viral etiology.
Duration of symptoms more than 10 days often indicates bacterial cause.
Imaging is not required for diagnosis unless complications are suspected.
Condition is usually self-limiting; however, symptomatic therapy is recommended.
Antibiotics are only recommended in select patient groups (e.g., immunocompromised or with severe disease).
Acute sinusitis (also commonly known as acute rhinosinusitis) is a symptomatic inflammation of the mucosal lining of the nasal cavity and paranasal sinuses, where clinical symptoms have been present for 4 weeks or less. It can be caused by either a viral or a bacterial infection. 
Chief Medical Information Officer
Medical Director of Inpatient Services
Chief of Otolaryngology
Rancho Los Amigos National Rehabilitation Center
GHS is a contractor with Medscape from WebMD and a consultant for Partnership for Health Analytic Research, LLC.
Dr Gordon H. Sun would like to gratefully acknowledge Dr Melissa A. Pynnonen and Dr Joseph K. Han, previous contributors to this topic.
Instructor of Otology and Laryngology
Harvard Medical School
Massachusetts Eye and Ear Infirmary
Department of Otolaryngology - Head and Neck Surgery
BSB is a co-founder and equity shareholder in Luxxeal, Inc.
Academic Medical Center
CG declares that he has no competing interests.
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