Corticosteroids are a type of steroid hormone produced by the adrenal cortex. They are essential for many bodily functions, including stress response, immune system regulation, and metabolism. Corticosteroids are also used to treat a variety of medical conditions, including allergies, asthma, and rheumatoid arthritis. Corticosteroids work by suppressing the immune system and reducing inflammation. They can be taken orally or through an injection. Oral corticosteroids are typically prescribed for short-term use, while longer-term use is more common when injected directly into the affected area. When taken orally, corticosteroids enter the bloodstream, where they bind to receptors on cells and cause them to produce hormones that reduce inflammation. These hormones, called corticosteroids, work by reducing the activity of the immune system and preventing an overactive response to allergens. When injected, corticosteroids are injected directly into the affected area and bind to receptors on the cells in that area, producing hormones that reduce inflammation. Injections of corticosteroids can provide quick relief of symptoms and may last for several weeks.