Endocrinologists are doctors trained to work with patients having hormone-related diseases. These doctors are trained to diagnose and manage diseases that affect the glands (adrenal glands, hypothalamus, ovaries and testicles, pancreas, parathyroid, pineal, pituitary, thymus, and thyroid) and the hormones. The endocrinologist helps in restoring hormone balance in the impacted gland. As part of their work, endocrinologists commonly treat diabetes, osteoporosis, menopause, metabolic disorders, thyroid diseases, some cancers (including thyroid cancer, pituitary tumor, parathyroid cancer, and adrenocortical carcinoma), short stature, and infertility.