Blumberg sign
（重定向自Rebound tenderness）
Blumberg's sign, also referred to as rebound tenderness, is a clinical sign that is elicited during physical examination of a patient's abdomen by a doctor or other health care provider. It is indicative of peritonitis. It refers to pain upon removal of pressure rather than application of pressure to the abdomen. (The latter is referred to simply as abdominal tenderness.)