Definition of Weight loss - unintentional:

Unintentional weight loss is a decrease in body weight that is not voluntary. In other words, you did not try to loss the weight by dieting or exercising.

See: Intentional weight loss

Common Causes:

There are many causes of unintentional weight loss. Some are listed below:

• AIDS
• Cancer
• Depression
• Diarrhea that is chronic (lasts a long time)
• Drugs, including amphetamines, chemotherapeutic agents, laxative abuse, and thyroid medications
• Drug abuse
• Eating disorders, including anorexia nervosa and bulimia
• Hyperthyroidism
• Infection
• Loss of appetite
• Malnutrition
• Manipulative behavior (in children)
• Painful mouth sores, mouth braces, or a loss of teeth that prevent you from eating normally
• Smoking

Note: This list may not be all inclusive