Adhesion, ad HEE zhuhn, in the body, is a name for new tissue that sometimes binds together internal organs that are normally separate. Such tissue usually grows as a result of inflammation or a surgical operation. Adhesions are often painful and may interfere with the normal work of the internal organs. Diseases of the heart or lungs may result in painful adhesions between those organs and the surrounding parts of the body. After abdominal operations, adhesions sometimes cause portions of the intestine to grow together or to the lining of the abdomen. If the adhesions interfere with digestion, additional surgical operations may be necessary. See also Tissue.