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.
Itchy Skin. Itchy skin can be defined as irritating and uncomfortable skin condition that causes itching that cannot be controlled. There are number of reasons that cause itchy skin. In medical terms, it is called Pruritus and itchy skin can be indicative of internal disease also. Itchy skin is always seen with dryness, rough skin, with bumps lesions or blisters. Unless your doctor identifies the correct cause for itchy skin, it may recur again or stay with you for prolonged time.