Unexpected weight loss

Unexpected weight loss is a significant decline in body weight that happens despite a person's lack of weight loss intent. Diet, exercise, or lifestyle changes are not the cause of the weight loss. A weight loss of 10 pounds or more, or 5% of body weight, over a six- to twelve-month period is regarded as "unexplained".

Unexpected weight loss may be a sign of a serious illness or condition. This makes it crucial to get medical help if you (or a member of your family) experience weight loss that cannot be explained. Weight loss that is unexplained can happen to anyone. However, those above the age of 65 are the ones who experience it most frequently (and severely). In older individuals, even unexplained weight loss of less than 5% of total weight, or 10 pounds, may be a symptom of a dangerous disease.