Find possible causes of numbness or tingling in hands based on specific factors. Check one or more factors on this page that apply to your symptom. Numbness or tingling. 1  Affects both hands. 2  Affects one hand.  Is intermittent.
These cells produce melanin, the substance that gives skin its color. Skin with too much melanin is called hyperpigmented skin. Skin with too little melanin is called hypopigmented skin. Pale skin areas are due to too little melanin or underactive melanocytes. Darker areas of skin (or an area that tans more easily) occurs when you have more melanin or overactive melanocytes. Bronzing of the skin may sometimes be mistaken for a suntan.
Too Much = Hyperthyroid. When the thyroid produces too much thyroid hormone, it is overactive. The condition is called hyperthyroidism. With hyperthyroidism, all of your major body systems are in overdrive, which can result in a host of unpleasant symptoms, from anxiety to diarrhea.our thyroid is an endocrine gland, and the hormones that it produces, thyroxine and triiodothyronine, often referred to collectively as thyroid hormone, help control the pace of all of your physiological body functions. When the thyroid produces too little hormone, things in your body can slow down too much.