Rhinosinusitis, commonly known as sinusitis, is an inflammation of the nasal passages and sinuses. It can be caused by infections, allergies, or irritants, leading to symptoms such as nasal congestion, facial pain, and a reduced sense of smell. The condition can be classified as acute, lasting less than four weeks, or chronic, persisting for more than twelve weeks. Treatment for rhinosinusitis often includes nasal decongestants, saline sprays, and sometimes antibiotics if a bacterial infection is suspected. In some cases, allergy management or surgery may be necessary to improve drainage and relieve symptoms. Maintaining good nasal hygiene can also help prevent the condition.