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Underactive Thymus: A deficiency in the level of activity of the thymus gland which results primarily in increased susceptibility to illness. The thymus gland is located beneath the breastbone and above the windpipe and heart. It is made up of lymphatic tissue and is believed to be responsible for supporting the development of the immune system from the fetal stage through to puberty. After puberty, the thymus gland tends to shrink. They thymus gland releases hormones which stimulate white blood cell production. More detailed information about the symptoms, causes, and treatments of Underactive Thymus is available below.
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