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.
Other symptoms that may occur along with itching skin. Itching skin may occur with symptoms related to body systems other than the skin including: Decreased appetite. Fatigue. Flu-like symptoms (fatigue, fever, sore throat, headache, cough, aches, and pains). Headache. Irritability in infants and children. Joint pain. Red eyes. Sneezing and runny nose. Stress.