Nasal corticosteroids are medications commonly used to treat nasal symptoms caused by allergies, such as hay fever and nasal congestion. They work by reducing inflammation in the nasal passages, which helps relieve symptoms like sneezing, runny nose, and itchy eyes. These medications are available in spray form and are typically used once or twice daily for effective relief. These corticosteroids are considered safe for most people when used as directed. Common examples include fluticasone, budesonide, and mometasone. While they can provide significant relief, it may take a few days of consistent use to notice the full benefits.