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.
Your GP will ask you about your symptoms â for example, if anything makes your itch worse, or if your itch comes and goes. They'll also examine your skin to look for visible symptoms. In some cases, they may take a skin scraping or a swab so it can be tested to help identify the cause of your itching.