Endocrinologists are doctors who specialize in diseases related to the glands of the endocrine system, such as hyperthyroidism, diabetes, and growth hormone deficiency. These diseases cause hormonal imbalances, and endocrinologists work with their patients to restore the body’s normal hormone levels. Patients suffer from various symptoms related to these illnesses, such as skin conditions and poor circulation, so the endocrinologist may treat these symptoms as well, or they may refer the patient to specialists for severe cases.