Hypothyroidism. Diffuse hair loss or alopecia due to hypothyroidism, the under activity of the thyroid gland. In adults, hypothyroidism causes mental and physical slowing, undue sensitivity to cold, slowing of the pulse, weight gain and a coarsening of the skin (known as myxoedema), often accompanied by hair loss. The condition is treated by the administration of the thyroid hormone thyroxine. In children, untreated hypothyroidism can cause cretinism, a syndrome involving mental retardation, dwarfism, and coarseness of the skin and facial features.
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