Medline Plus: Sinusitis Medline Plus: Sinusitis congestion MedlinePlus: Medical Encyclopedia: Sinusitis. Sinusitis Sinusitis Sinusitis Sinusitis Medline Plus: Sinusitis Medline Plus: Sinusitis Sinusitis org https://medlineplus.gov/ency/article/000647.htm Sinusitis Sinusitis Sinusitis