The symptoms of sinusitis vary significantly between individuals. In cases of mild inflammation, there may be no symptoms, and the condition might only be discovered during a physical examination or through a head or sinus CT scan. However, in some patients with more severe inflammatory reactions, clinical symptoms can occur. Common clinical symptoms include nasal congestion, thick nasal discharge, reduced sense of smell, headache, dizziness, as well as potential facial pain, numbness, and vertigo. Some individuals may also experience changes in vision or field of vision. Generally, sinusitis is a common disease. Usually, it can be diagnosed based on clinical symptoms and examination of the nasal cavity. Some patients may need to undergo a CT scan, and in severe cases, surgery might be considered necessary.