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In many cases, people who are perfectly healthy can be "underweight." They may have a high metabolism or have lean genes. When you are atypically underweight, and under the care of a physician, they will probably look at factors and symptoms that might be causing the weight problem. Being underweight can indicate several conditions and diseases including Diabetes Type I (in adolescents), hyperthyroidism, under consumption of food and nutrients, overtraining with exercise, AIDS, cancer, parasitic infection or anorexia and bulimia. All of these conditions would cause a person to be underweight, or to undergo a sudden weight loss. If you are not under the care of a physician and have experienced a drop in weight, you should see a doctor as soon as possible.