Endocrinologist
Overview and Key Facts

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An endocrinologist could...Overview Listen to this section
Hormones may be small, but they affect our bodies in huge ways. (For example, growth hormone can affect how tall someone grows, and how strong their bones are.) Endocrinologists know this well. Endocrinologists are medical doctors who specialize in diagnosing and treating conditions related to the endocrine system, which secretes small chemicals called hormones. Endocrinologists also investigate ways to improve diagnoses of and treatments for these conditions.
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Steps to Get There: Becoming an Endocrinologist
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Career Pathway Listen to this section
To practice as an endocrinologist, you must have eight years of education beyond high school, including medical school. This is then followed by five–seven years of training, specifically as a medical resident in a related discipline, and then a fellowship in endocrinology. In the United States, endocrinologists are board certified by the American Osteopathic Board of Internal Medicine or the American Board of Internal Medicine.
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Typical degree for an entry-level position: Doctoral or professional degree ?
To become a board-certified endocrinologist, several requirements must be met:
- Four years of premedical education in a college or university.
- Four years of medical school resulting in an MD (Doctor of Medicine degree).
- Three or four years in a medical residency, typically in internal medicine, obstetrics and gynecology, or pediatrics.
- Two to three year fellowship in endocrinology, learning firsthand how hormone conditions are diagnosed and treated. An endocrinologist may receive multidisciplinary training or further specialize, such as in adult, diabetes-related, pediatric, or reproductive endocrinology. During this time, the person may also focus on either having a clinical or a research career.
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On the Job
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Nature of the Work
An endocrinologist is a medical doctor who has been specially trained in the diagnosis and treatment of patients with conditions related to the endocrine system. The endocrine system is made up many different glands, such as the pituitary gland, thyroid, kidneys, reproductive glands, and others. These glands produce hormones, which are small chemicals that can have large, relatively long-lasting effects on the body.
An endocrinologist may specialize in a certain gland and its related conditions, or an endocrinologist may specialize in treating a group of individuals who often have similar endocrine-related conditions. To diagnose a patient, the endocrinologist talks to the patient to understand the symptoms and other possible complicating factors. Since an endocrinologist is a specialist, patients are often referred to an endocrinologist by their primary doctor, and so the endocrinologist often also has notes from the primary doctor to review and consider. Depending on the patient's condition, the endocrinologist may also perform additional tests on the patient and on fluid samples to diagnose their condition. Depending on the diagnosis, the endocrinologist may administer many different types of treatments.
Here are just some of the areas that an endocrinologist may specialize in:
- Thyroid: The thyroid is an endocrine gland in the neck that produces hormones to help regulate metabolism, weight, growth rate, and other functions. Hormone-related medical conditions can result if the thyroid is overactive, underactive, or being attacked by an autoimmune disorder (such as in Graves' disease). As one example of treatment, if a patient has an underactive thyroid, an endocrinologist may prescribe medications that replace the hormones. In addition to the thyroid, endocrinologists may specialize in other endocrine glands, such as the pituitary gland, parathyroid glands, adrenal glands, islets of Langerhans, and testes.
- Diabetes: A person with diabetes is diagnosed with blood glucose levels that are above normal, which is usually due to a problem with insulin (which is a hormone). An endocrinologist runs specific tests on a patient to diagnose them with diabetes and also looks for other symptoms related to the disease. After diagnosis, the endocrinologist may come up with a treatment plan for the patient that involves insulin injections.
- Pediatric care and growth hormones: Hormones play a large role in childhood development (and are also important for adults to be healthy). An endocrinologist may perform blood tests on a patient to check the levels of different growth hormones, ensuring the right amount is present. The endocrinologist may also ask for imaging of certain glands in the patient to be done. Treatment depends on the patient's specific condition but may involve administration of hormone supplements.
- Reproduction: For a woman or a man to be fertile, certain hormones should be produced by their reproductive organs. Different hormones and therapies may be administered to help a couple conceive, such as in in vitro fertilization.
Work Environment
Endocrinologists may work in a small practice or in a larger group, such as in a hospital. If an endocrinologist works in their own small practice, they may also handle the business aspects of their practice, such as managing a staff of nurses and other administrative personnel. If they are part of a larger group, they may actively involve themselves in collaborations with others in that group, such as by serving on committees (which are organized subgroups that meet regularly to make decisions about how to run different parts of the large group itself) or participating in large research projects. They may also work closely with other specialists—like surgeons—to treat patients, such as by developing a surgery treatment for a patient who has an endocrine gland abnormality.
Endocrinologists may travel between several different locations, including a hospital or other medical facility (where they work on a part-time or contract basis as a specialist), a lab (where they analyze biological samples from patients), and a private office (where they do paperwork, read up on research, and write up their own research findings). They often encounter stressful situations where they need to remain calm and keep patients calm.
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Additional Resources
Sources
- U.S. Bureau of Labor Statistics BLS (2024). Occupational Outlook Handbook (OOH), 2024 Edition, Bureau of Labor Statistics. Retrieved August 25, 2025.
- National Center for O*NET Development O*Net Online (2024). National Center for O*Net Development. Retrieved August 25, 2025
- Alyson, Jennifer. (n.d.). What Tests Does an Endocrinologist Perform? Houston Chronicle. Hearst Communications, Inc. Retrieved July 12, 2013.
- Mandal, Ananya. (n.d.). Endocrinologist — What is an Endocrinologist? News-Medical.Net. Retrieved July 12, 2013.
- Cedars-Sinai. (n.d.). Endocrinology Treatments and Programs. Retrieved July 12, 2013.
- Mayo Clinic. (n.d.). Endocrinology. Retrieved July 12, 2013.
- O'Brien, Michael. (2008, May 24). 20 Questions: Lawrence Terra, MD [Reproductive Endocrinology]. The Student Doctor Network. Retrieved July 16, 2013.
- Community Health Network. (2009, December 11). Dr. David Carnovale, reproductive endocrinologist. Communityfertility.com. Retrieved July 12, 2013.















