Rhinosinusitis is an inflammatory condition of the nose and sinuses and usually develops due to infections, allergies or exposure to irritants. This disease can be acute or chronic. Acute rhinosinusitis is usually caused by bacterial or viral infections after a cold and symptoms include nasal congestion, facial pain, headache, nasal discharge and loss of smell. Chronic rhinosinusitis is characterised by recurrent infections lasting longer than 12 weeks. Treatment is with antibiotics, decongestants, nasal sprays and painkillers depending on the type of infection. In cases of allergic rhinosinusitis, avoidance of allergens and antihistamines are recommended. Surgical intervention may be required in severe cases.