1 An adenoma is a part of the gland that has walled itself off from the rest of the gland, forming noncancerous (benign) lumps that may cause an enlargement of the thyroid. Not all adenomas produce excess T-4, and doctors aren't sure what causes some to begin producing too much hormone.  Thyroiditis.
Scratching Itchy Skin Causes Brain To Release Hormone Serotonin, Intensifies Itchy Sensation. While a good scratch may temporarily relieve you of your itch, it actually stimulates serotonin in the brain that intensifies the itchy feeling.
For some people, the itching their whole body feels drives them crazy, especially when there is no visible rash or skin reaction that accompanies the itching. If itchy skin is a condition you battle all the time, read on to find out how to make the itching stop once and for all. Causes Of Itching All Over The Body There are many causes of itching all over the body, most of which are temporary.