An endocrinologist is the primary doctor who diagnoses and manages Cushing’s disease, but treatment typically involves a team of specialists. Because Cushing’s disease is caused by a tiny tumor on the pituitary gland that drives the body to produce too much cortisol, you’ll likely work with both hormone specialists and surgeons over the course of your care.
Your Primary Care Doctor’s Role
Most people don’t start with a specialist. A primary care doctor is usually the first to notice the pattern of symptoms that points toward Cushing’s disease: rapid central weight gain with a rounded face, wide purple stretch marks, easy bruising, muscle weakness in the upper arms and thighs, high blood pressure that doesn’t respond well to medication, or new diabetes that’s hard to control. No single symptom is enough on its own. Guidelines recommend suspecting Cushing’s when two or more of these features cluster together without another explanation, especially if the changes happened quickly or seem out of proportion to age and lifestyle.
A primary care doctor can order initial screening tests, such as a 24-hour urine cortisol collection or a late-night saliva sample to check whether cortisol levels are abnormally high in the evening (when they should be low). If results come back elevated, the next step is a referral to endocrinology for confirmation and further workup.
The Endocrinologist: Your Central Specialist
An endocrinologist, a doctor who specializes in hormone-related conditions, becomes the quarterback of your care. Their job is to confirm the diagnosis, figure out exactly what’s causing the excess cortisol, and coordinate the treatment plan.
Confirmation involves repeating and expanding on those initial cortisol tests. Blood and urine samples measure cortisol and a signaling hormone called ACTH, which tells the endocrinologist whether the problem is coming from the pituitary gland, the adrenal glands, or somewhere else entirely. They may also use hormone suppression tests, giving you a medication that should lower cortisol in a healthy person and seeing how your body responds.
Once excess cortisol is confirmed and ACTH levels point toward a pituitary source, the endocrinologist orders imaging, typically an MRI of the brain, to look for the tumor. If the MRI doesn’t show a clear tumor (pituitary tumors in Cushing’s are often very small), a more specialized test called inferior petrosal sinus sampling may be needed. In this procedure, interventional radiologists thread thin catheters into veins near the pituitary gland and compare ACTH levels there to levels in the rest of the bloodstream, pinpointing the source.
The Neurosurgeon: First-Line Treatment
Surgery is the preferred treatment for Cushing’s disease, and that means a neurosurgeon becomes a key member of the team. The standard operation is called transsphenoidal surgery: the surgeon reaches the pituitary tumor by going through the nose and the sphenoid sinus, one of the air spaces behind it, rather than opening the skull. The working space is tiny, roughly half an inch, so surgeons rely on high-powered microscopes or fiberoptic endoscopes to see the tumor.
There are a few variations on the approach. Many neurosurgeons now go directly through the back wall of the nose. Others make a small incision along the nasal septum and create a tunnel to the sphenoid sinus. In rare cases where the tumor can’t be reached this way, a craniotomy (opening the skull) is required, but this is uncommon.
Surgeon experience matters enormously here. Remission rates for transsphenoidal surgery average around 66%, with some patients achieving remission immediately after surgery and others seeing cortisol levels normalize over the following weeks. However, recurrence is a real concern. In long-term follow-up averaging about six years, roughly 41% of patients who initially went into remission eventually relapsed. This is why choosing a surgeon with extensive pituitary experience, ideally at a center that handles a high volume of these cases, makes a meaningful difference in outcomes.
When Other Surgeons Get Involved
If pituitary surgery doesn’t achieve lasting remission, or if the disease recurs, an endocrine surgeon (sometimes called an adrenal surgeon) may enter the picture. One option for persistent Cushing’s disease is removing both adrenal glands, the organs that actually produce cortisol. This eliminates excess cortisol production but means you’ll need to take replacement hormones for life, since your body can no longer make cortisol or aldosterone on its own.
Bilateral adrenalectomy also carries a specific risk: in about 20% of patients, the pituitary tumor grows aggressively after the adrenal glands are removed, a condition called Nelson’s syndrome. The pituitary, no longer getting the cortisol signal it expects, ramps up its hormone production even further, causing the tumor to enlarge. This requires ongoing monitoring and sometimes additional treatment.
Radiation and Radiology Specialists
A radiation oncologist may join the team if surgery doesn’t fully remove the tumor or if the disease comes back. Targeted radiation, such as stereotactic radiosurgery, can be directed at pituitary tumor tissue with high precision. The effects of radiation are gradual, often taking months to years to fully lower cortisol levels, so medication is usually needed in the interim.
Interventional radiologists also play a behind-the-scenes role in diagnosis, particularly when performing the petrosal sinus sampling procedure described above. And neuroradiologists, who specialize in reading brain imaging, are critical for interpreting pituitary MRIs where tumors may be only a few millimeters across.
Medication Management
When surgery isn’t possible, hasn’t worked, or you’re waiting for radiation to take effect, your endocrinologist may prescribe medications that block cortisol production. One option approved in the U.S. specifically for Cushing’s disease works by inhibiting an enzyme in the adrenal glands that’s essential for making cortisol. It received FDA approval in March 2020. Other medications target the pituitary tumor itself to reduce the signaling hormone that drives cortisol overproduction. These drugs don’t cure the disease but can control cortisol levels and relieve symptoms while other treatments are planned or take effect.
Why a Multidisciplinary Center Matters
Cushing’s disease is uncommon, and getting the diagnosis right is notoriously difficult. Cortisol levels can fluctuate, symptoms overlap with far more common conditions like metabolic syndrome, and pituitary tumors may be too small to see on imaging. The full team for comprehensive care includes endocrinologists, neurosurgeons, interventional radiologists, neuroradiologists, and sometimes radiation oncologists and adrenal surgeons.
Centers that treat a high volume of pituitary disorders keep all of these specialists under one roof, which streamlines communication and shortens the often frustrating path from first symptoms to treatment. If you’re starting this process, the most important first step is getting to an endocrinologist with experience in Cushing’s, who can then connect you with the right surgical and imaging specialists from there.