Keep on top of your health. If you frequently feel lethargic and cold, and gain weight easily you may suffer from hypothyroidism (underactive thyroid). On the other hand, if you are often jittery, but tired, and lose weight without dieting you may suffer from hyperthyroidism (overactive thyroid). Nodules (lumps and bumps) can also form on the thyroid, but not cause problems or may be a sign of cancer.

Depending upon your condition, you may be treated through hormone therapy, surgery or other procedures.