TNF inhibitors are a class of medications designed to block the action of tumor necrosis factor (TNF), a protein in the body that plays a key role in inflammation. By inhibiting TNF, these drugs help reduce inflammation and alleviate symptoms in various autoimmune conditions, such as rheumatoid arthritis, psoriasis, and Crohn's disease. These medications can be administered through injections or infusions and are often prescribed when other treatments have not been effective. While TNF inhibitors can significantly improve quality of life for many patients, they may also carry risks, including increased susceptibility to infections and other side effects.