Nasal corticosteroids are medications used to treat inflammation in the nasal passages. They are commonly prescribed for conditions like allergic rhinitis and sinusitis, helping to relieve symptoms such as nasal congestion, sneezing, and runny nose. These medications work by reducing swelling and irritation in the nasal tissues. Typically available as nasal sprays, nasal corticosteroids are effective for both seasonal and year-round allergies. They are generally safe for long-term use when taken as directed, but it is important to follow a healthcare provider's instructions to minimize potential side effects, such as nasal irritation or bleeding.