Mucoadhesion refers to the ability of certain materials to adhere to mucus membranes. This ability is often desirable in medical and pharmaceutical applications where sustained or targeted delivery of a substance is desired. Synonyms for mucoadhesion include mucin interaction, bioadhesion, mucosal adhesion, and mucosal retention. Other related terms include mucoadhesive polymers and mucoadhesive drug delivery systems. These terms are often used in the development of topical treatments for conditions such as dry eye, oral mucositis, and nasal allergies. Mucoadhesive materials can also be used in the development of targeted drug delivery systems for diseases such as cancer, resulting in increased effectiveness and reduced side effects.