A doctor who specializes in hormones is called an endocrinologist. Endocrinologists are medical specialists who diagnose and treat conditions caused by problems with the glands and hormones that regulate your body. If your primary care doctor suspects a hormone-related issue, this is the specialist they’ll refer you to.
What an Endocrinologist Does
Your body has a network of glands called the endocrine system. These glands produce hormones that control everything from your metabolism and growth to your mood, blood sugar, and reproductive function. An endocrinologist focuses on disorders involving these glands, which include the thyroid, pituitary gland, adrenal glands, parathyroid glands, pancreas, ovaries, and testes.
The range of conditions they handle is broad. Some of the most common include diabetes, hypothyroidism (underactive thyroid), hyperthyroidism (overactive thyroid), polycystic ovary syndrome (PCOS), Cushing’s syndrome, Addison’s disease, Graves’ disease, and growth hormone disorders like acromegaly. They also manage conditions involving calcium and vitamin D, adrenal insufficiency, and tumors of the pituitary gland.
Types of Hormone Specialists
Not all endocrinologists focus on the same things. There are a few distinct paths within the specialty.
A general endocrinologist handles the full range of hormone disorders in adults, from thyroid disease to diabetes to adrenal problems. This is the type of doctor most people mean when they say “hormone doctor.”
A pediatric endocrinologist treats hormone-related conditions in children and adolescents. Their focus areas include short stature and growth problems, early or delayed puberty, childhood diabetes, thyroid disorders like goiter, low blood sugar, obesity, and conditions affecting vitamin D and bone health such as rickets. If your child’s growth pattern has been flagged at a checkup, this is the specialist your pediatrician would recommend.
A reproductive endocrinologist is actually an OB/GYN who has done additional training in hormones related to reproduction. They primarily treat infertility and other reproductive hormone disorders. Despite the shared word “endocrinologist,” their training path is different from a general endocrinologist’s. They come through obstetrics and gynecology rather than internal medicine.
How They Diagnose Hormone Problems
Endocrinologists rely heavily on blood tests, since hormones circulate in your bloodstream. A basic hormone panel can measure levels of thyroid hormones, cortisol, insulin, testosterone, estrogen, or growth hormone depending on your symptoms. Some hormones fluctuate throughout the day, so your doctor may order tests that track a related marker instead. For example, rather than measuring growth hormone directly (which spikes and dips), they often measure a hormone called IGF-1, which stays more stable and reflects your overall growth hormone activity.
For more complex cases, stimulation or suppression tests are used. In a stimulation test, you’re given a substance that should trigger a gland to produce a hormone, and blood is drawn over one to two hours to see whether the gland responds normally. A suppression test works the opposite way: you drink a glucose solution, and the doctor checks whether a hormone (like growth hormone) drops as it should. If it doesn’t, that can point to a tumor or overactive gland. Imaging, such as ultrasound of the thyroid or MRI of the pituitary gland, is sometimes added to get a clearer picture.
What Treatment Looks Like
Treatment from an endocrinologist usually centers on correcting hormone levels, either by replacing what your body isn’t making enough of or by suppressing overproduction. The specific approach depends entirely on the condition.
Hormone replacement can be delivered in several ways. Tablets are the most common form, but skin patches that release hormones gradually are also widely used. Gels that you rub into the skin, nasal sprays, and injections are other options. For reproductive hormone issues, there are also vaginal creams, rings, and pessaries. Testosterone replacement typically comes as a gel. Your endocrinologist will choose the delivery method based on which hormone needs replacing, how your body absorbs it, and your preferences.
Beyond hormone replacement, endocrinologists also manage conditions like diabetes with blood sugar monitoring, medication adjustments, and long-term metabolic planning. For gland tumors causing hormone overproduction, they coordinate with surgeons when needed.
Signs You May Need a Referral
Most people see an endocrinologist after their primary care doctor notices something unusual in blood work or symptoms. Common reasons for referral include unexplained weight changes, persistent fatigue, a thyroid nodule or enlarged thyroid, difficulty getting pregnant, irregular periods, abnormal blood sugar levels, or unusual changes in hair growth or skin. In children, a growth rate that’s falling off the expected curve or signs of puberty appearing unusually early or late are typical triggers.
Some situations call for a faster referral: a new diabetes diagnosis, a thyroid nodule that’s growing or causing discomfort, rapid changes in a child’s growth paired with headaches or vision problems, or dangerously low blood sugar episodes. In these cases, your primary care doctor will typically push for a specialist appointment within days rather than weeks.
If your hormone levels are only mildly off, your primary care doctor may manage the issue themselves, at least initially. Endocrinologist referrals tend to happen when levels are significantly abnormal, when initial treatment isn’t working, or when the condition is complex enough to need specialized monitoring over time.