What Causes Nodules On The Adrenal Gland? | Next Steps

Seeing “adrenal nodule” on a scan report can feel scary. In many cases, the causes of adrenal gland nodules are benign, and the lump never causes trouble.

The adrenal glands make hormones that steer blood pressure and stress response. So one word—nodule—can mean two different things: a lump that sits quietly, or a lump that releases hormones.

What Causes Nodules On The Adrenal Gland?

An adrenal nodule is a spot of tissue on an adrenal gland that looks different from the rest of the gland on a CT or MRI. Many are found by chance during imaging done for another reason. You may see the term “adrenal incidentaloma,” which means an unexpected adrenal mass found on imaging.

Most causes fall into these groups: benign cortex growths, hormone-making tumors, fatty or fluid-filled lesions, bleeding into the gland, infection, spread from a cancer elsewhere, or a rare primary adrenal cancer.

Common Nodule Type	How It Starts	Clues That Often Go With It
Nonfunctioning adrenal adenoma	Benign overgrowth of adrenal cortex cells	Often found on CT; no hormone symptoms
Cortisol-producing adenoma	Benign tumor that releases cortisol	Weight gain in the midsection, bruising, high sugar, weak muscles
Aldosterone-producing adenoma	Benign tumor that releases aldosterone	High blood pressure, low potassium, cramps
Androgen-producing tumor	Adrenal tumor that releases sex hormones	New facial hair, acne, voice changes, cycle changes
Pheochromocytoma	Tumor from adrenal medulla cells that releases catecholamines	Spells of pounding heart, sweating, headache, blood pressure spikes
Myelolipoma	Benign mix of fat and marrow-like tissue	Fatty look on imaging; usually quiet unless large
Adrenal cyst	Fluid-filled lesion, sometimes from old bleeding	Thin-walled, fluid look on imaging; symptoms only if large
Adrenal hemorrhage	Bleeding into the gland after stress, injury, or blood thinners	Sudden side or back pain, anemia, low blood pressure
Metastasis to the adrenal	Cancer cells spread from another organ	Past cancer history; imaging may look less typical for adenoma
Adrenocortical carcinoma	Rare cancer of the adrenal cortex	Large mass, growth over time, or hormone excess signs

Causes Of Adrenal Gland Nodules With Plain-Language Labels

Benign adrenal adenomas

Adenomas are the most common reason a scan shows an adrenal nodule. Many adenomas do not release extra hormones, so a person feels normal and the finding is a surprise.

Doctors still check two things: hormone output and imaging pattern. That combo sorts most nodules into “watch” or “treat.”

Hormone-making adenomas and nodules

Some adrenal nodules act like tiny hormone factories. The hormone made shapes the symptom pattern:

• Cortisol: weight gain in the trunk, easy bruising, weak muscles, higher blood sugar.
• Aldosterone: high blood pressure and low potassium, with cramps or weakness.
• Androgens or estrogen: acne, new hair growth, voice changes, irregular periods.

Plenty of common conditions can mimic these signs. Still, when a nodule and a hormone pattern match, it gives a clean target for lab testing.

Pheochromocytoma

Pheochromocytomas grow from the adrenal medulla, the inner part of the gland. These tumors can release bursts of adrenaline-like hormones. People may get episodes of racing heart, sweating, headache, or blood pressure spikes.

This matters because certain medicines and procedures can trigger dangerous blood pressure swings if the tumor is missed. That’s why many workups include a metanephrine test.

Myelolipomas and cysts

A myelolipoma is a benign adrenal mass that contains fat. Many are found on scans and never cause symptoms. When large, they can ache or bleed inside the mass.

Adrenal cysts are fluid-filled lesions. Most are quiet. Clinicians watch size, pain, and imaging traits that do not fit a simple fluid pocket.

Bleeding into the gland

Adrenal hemorrhage can create a new nodule-like appearance on imaging. It can follow a major illness, severe physical stress, injury, surgery, childbirth, or blood-thinner use. Some cases show up with sudden side or back pain.

When bleeding affects both glands, adrenal hormone output can drop. That can cause weakness, nausea, confusion, and low blood pressure. That pattern needs urgent medical care.

Metastasis and primary adrenal cancer

The adrenal glands can be a site for metastases, meaning cancer cells that travel from another organ.

Primary adrenal cancer, called adrenocortical carcinoma, is rare. It may show up as a large mass, growth on repeat imaging, pain from pressure, or hormone excess signs. The NCI adrenocortical carcinoma treatment PDQ lists standard testing and treatment.

How A New Adrenal Nodule Gets Worked Up

After a nodule is found, the next steps answer two questions: Is it making hormones? Does it look benign on imaging? The answers shape follow-up timing and whether surgery is on the table.

Many clinics use structured guidance such as the ESE guideline on adrenal incidentalomas, which lists standard hormone tests and imaging checkpoints.

Imaging details that steer the plan

CT and MRI reports often list size, edges, and density traits. Benign adenomas often fit a harmless pattern, while other lesions can look denser or more irregular. Some reports even state “consistent with adenoma” when the pattern is clear.

If your report feels vague, ask whether the scan was an adrenal-protocol study. A general scan can spot a mass but often miss details that help label it.

Hormone tests that are often ordered

Even a small nodule can release hormones. A common starting set may include:

• An overnight dexamethasone suppression test for cortisol excess
• Blood or urine metanephrines for pheochromocytoma
• Aldosterone and renin checks in people with high blood pressure or low potassium
• Extra hormone tests when signs point to sex-hormone excess

Testing choices shift with your meds and health history. Bring a full list of pills, inhalers, creams, injections, and supplements, since steroid exposure can skew cortisol results.

When Symptoms Call For Same-Day Care

Many people with an adrenal nodule feel fine. Still, a few patterns deserve quick attention:

• Sudden severe side or belly pain with dizziness or fainting
• Repeated spells of pounding heart, sweating, shaking, and headache with blood pressure spikes
• Worsening weakness, vomiting, confusion, or low blood pressure
• Fast-moving hormone changes like rapid new hair growth or voice deepening

If you’re in the middle of one of these, don’t wait for a routine visit. Seek urgent care or emergency care based on symptom intensity.

Treatment Paths After The Cause Gets Clear

Once the type is clearer and hormone testing is back, care often falls into three tracks: watchful follow-up, medication, or surgery.

Watchful follow-up fits many benign-appearing nodules that do not make hormones. Plans can include repeat imaging or labs, based on results.

Medication can help control blood pressure, potassium, or hormone effects. Some people use meds long term when surgery is not the plan.

Surgery is more common when a tumor makes hormones, grows, has scan traits that raise concern, or causes symptoms from size or bleeding. If pheochromocytoma is on the list, blood pressure prep before surgery is part of safe care.

Finding	What It Can Point To	Usual Next Step
Nodule with benign adenoma traits on CT	Nonfunctioning adenoma	Hormone screen; follow-up imaging only if advised
High metanephrines	Pheochromocytoma	Specialist planning and blood pressure prep before surgery
Failed dexamethasone suppression	Cortisol excess from adrenal source	Repeat testing and check for cortisol-linked conditions
High aldosterone with low renin	Aldosterone-producing adenoma	Confirmatory testing and blood pressure treatment plan
Growth on repeat imaging	Higher malignancy risk or bleeding	Adrenal-protocol imaging and surgical review
Past cancer history plus new adrenal mass	Metastasis	Coordinate with oncology; biopsy planning only after hormone rule-outs
Macroscopic fat in the mass	Myelolipoma	Observation unless large, painful, or bleeding
Large mass with hormone excess signs	Adrenocortical carcinoma	Referral to a center with adrenal cancer experience

Questions To Bring To Your Next Visit

Walking in with a short list can keep the visit on track. These prompts fit most cases:

• What is the nodule size in millimeters, and is it on the right or left adrenal gland?
• Does the imaging description fit adenoma, myelolipoma, cyst, bleeding, or something else?
• Which hormone tests do you want, and which meds could skew them?
• Do I need an adrenal-protocol CT or MRI, or is the current scan enough?
• What changes should make me call sooner?
• If surgery is planned, what prep is needed and what approach is used?

A Two-Week Checklist After You Get The Report

This is the practical “do this next” list many people want on day one. Use it to stay organized while you wait for visits and labs.

1. Get the radiology report and your images through the portal or on disk.
2. Write down symptoms from the last six months, if they seem random.
3. List meds, inhalers, creams, injections, and supplements with doses.
4. Note recent blood pressure readings and any low potassium results.
5. Book the first lab tests and ask if fasting is needed.
6. Ask if a repeat scan is planned, and if yes, what timing is set.
7. If you have a cancer history, tell the ordering clinician right away.

If you’re trying to decide what causes nodules on the adrenal gland? your next best move is the hormone screen plus a clear read of imaging traits. Those two pieces sort most cases into a calm follow-up plan or a faster workup.

If testing raises concern for a rare cancer, ask where you should be seen and what tests are next.

And if you’re still stuck on what causes nodules on the adrenal gland? after the first results, ask your clinician for the likely type in plain terms. A label like “benign adenoma” or “pheochromocytoma ruled out” can take the sting out of the unknown.