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 example, you may have severe skin burning and itching once and a while and not that often, feel it off and on, or feel the burning and itching all the time. This burning itching skin sensation may precede, accompany, or follow an escalation of other anxiety sensations and symptoms, or occur by itself.