special subjects
Involuntary Weight Loss
Introduction
Involuntary weight loss refers to weight loss that occurs when a person is not dieting or otherwise trying to lose weight. Because everyone's weight goes up and down slightly over time (such as during an illness), doctors typically become concerned about involuntary weight loss only when people lose more than about 10 pounds (4 to 5 kilograms) or, in smaller people, 5% of their body weight. Such weight loss can be a sign of a serious physical or emotional or mental disorder. In addition to weight loss, people may have other symptoms, such as loss of appetite, fever, pain, or night sweats, due to the underlying disorder. 