Mucositis is an inflammation of the mucous membranes, which can occur in various parts of the body, including the mouth and gastrointestinal tract. It is often a side effect of treatments like chemotherapy or radiation therapy, particularly in patients with cancer. Symptoms may include pain, swelling, and ulceration, making it difficult to eat or swallow. The condition can lead to complications such as infections and may require medical intervention. Treatment options often focus on pain relief and maintaining oral hygiene. Preventive measures, such as using mouth rinses, can help reduce the severity of mucositis in at-risk patients.