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.
1 I tell my patients to slap an ice pack on the itchy skin because when the nerve is so busy telling you your skin is cold it canât tell you that your skin itches.  I also stress the importance of not scratching! Scratching causes skin nerves to thicken up and send even louder itch messages to your brain in the future.