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.
But anxiety causes a great deal of stress, and stress has a damaging effect on organs. Since your skin is the largest organ on your body, anxiety is known to lead to rash and a feeling of itch. When it's anxiety, you'll rarely have only itchy skin. It's almost always accompanied by other symptoms. If you haven't yet, take the free 7 minute anxiety test. I developed for figuring out which of your symptoms are likely anxiety, and which are not.