There are a number of illnesses and diseases that could cause you to be underweight. If diagnosed and treated properly,
they can either be cured, or managed successfully so that you will return (or achieve for the first time) a healthy weight.
Here's a list of some of the diseases. Clicking on the names will take you to the respective pages, where you will find
descriptions of the disease, most common symptoms, as well as more links to help you understand the condition.
Celiac Disease
Irritable Bowel Syndrome (IBS)
Crohn's Disease & Colitis
Hyperthyroidism (overactive thyroid)
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