Pheochromocytoma: Risk Factors, Causes and Symptoms

If your body had a “fight-or-flight” button, your adrenal glands would be sitting on it like a cat on a keyboardready to
smash it at the worst possible time. Most days, that system is helpful. It boosts your heart rate, tightens blood vessels,
and gives you energy when you’re stressed or scared.

A pheochromocytoma (fee-oh-kroh-moh-sy-TOH-muh) is a rare tumorusually in the adrenal glandthat can
release too much of those fight-or-flight hormones (called catecholamines, like adrenaline/epinephrine and noradrenaline/norepinephrine).
The result can feel like your body is stuck in “emergency mode,” sometimes in sudden, intense waves.

This article breaks down the causes, risk factors, and symptoms of pheochromocytoma in plain American English
(with just enough humor to keep things readable). It’s educationalnot a diagnosisso if anything here sounds familiar, it’s worth discussing with a clinician.

Quick Snapshot: What Makes Pheochromocytoma Different?

• Where it starts: typically the adrenal medulla (the “center” of the adrenal gland).
• What it does: may release bursts of catecholamines that spike blood pressure and trigger classic symptoms.
• How it shows up: symptoms can be constant, episodic (“spells”), or sometimes absent.
• Why it matters: untreated hormone surges can stress the heart, brain, and kidneys.
• Big clue: symptoms often come in clusters and may be triggered by specific events or foods.

What Is a Pheochromocytoma (and How Is It Related to Paraganglioma)?

Pheochromocytomas come from chromaffin cells, which are built to make catecholamines. Think of chromaffin cells as the body’s
“high-alert hormone factory.” In a pheochromocytoma, that factory can start shipping out adrenaline-like hormones when it shouldn’t.

You’ll often see pheochromocytoma discussed alongside paraganglioma. The simplest way to remember it:
pheochromocytoma is usually in the adrenal gland, while paragangliomas form outside the adrenal gland in related nerve tissue.
Both can be grouped under the umbrella term PPGL (pheochromocytoma/paraganglioma) because they behave similarly in many ways.

Causes: What Actually “Causes” the Symptoms?

Let’s separate two ideas that people often mix up:

• Cause of the tumor: why the tumor forms in the first place (often genetic, sometimes unknown).
• Cause of the symptoms: why you feel the way you feel (too much catecholamine release).

1) Hormone surges (catecholamines) drive most symptoms

When catecholamines rise, they can:
tighten blood vessels (raising blood pressure), speed up the heart, trigger sweating and tremor, and create that
“something is very wrong” sensation. If the tumor releases hormones in bursts, symptoms can hit in episodes that
start suddenly, peak fast, and end abruptlyleaving you feeling oddly normal again, like nothing happened.

2) The tumor may be sporadicor linked to inherited gene changes

In many people, pheochromocytoma happens “out of the blue.” But a substantial portion are connected to inherited genetic
syndromes. That’s why clinicians often consider genetic counseling/testing after diagnosis, especially for people who are younger,
have multiple tumors, have paragangliomas, or have a family history.

3) Triggers can “press play” on an episode

Not everyone has clear triggers, but many people notice spells occur during certain situationslike hard physical activity, medical procedures,
or eating particular foods. Triggers matter because they can explain why symptoms seem random until you zoom out and notice patterns.

Risk Factors: Who’s More Likely to Develop a Pheochromocytoma?

There isn’t a single lifestyle factor (like “too much coffee” or “too many horror movies”) that reliably causes pheochromocytoma.
The biggest recognized risk factors are genetic and syndrome-related.

1) Family history and inherited syndromes

Several inherited conditions are well known to raise risk. The most commonly discussed include:

• MEN2 (Multiple Endocrine Neoplasia type 2) often associated with RET gene changes.
• Von Hippel–Lindau (VHL) disease associated with VHL gene changes.
• Neurofibromatosis type 1 (NF1) associated with NF1 gene changes.
• Hereditary paraganglioma-pheochromocytoma syndromes commonly involving SDHx genes (such as SDHB, SDHD, and related genes).

In hereditary PPGL syndromes, risk can run in families in an autosomal dominant pattern (meaning a parent can pass it on, and each child can have a significant chance of inheriting the gene change).
Importantly, inheriting a risk gene doesn’t guarantee a tumorbut it increases the odds enough that screening plans may be recommended.

2) Prior or related tumors in the PPGL “family”

If someone has had a paraganglioma or pheochromocytoma before, clinicians keep a closer eye out for recurrence or additional tumorsespecially when a genetic mutation is involved.

3) Age: can occur at many ages, often found in adults

Pheochromocytoma can occur at different ages, including in younger peopleespecially in hereditary cases. Many resources describe it as more commonly identified in adults,
but the “who” matters less than the pattern of symptoms and the presence (or suspicion) of an inherited syndrome.

4) Risk factors for more aggressive behavior (a careful note)

Most pheochromocytomas are not cancerous, but some can behave aggressively or spread. Certain patternslike extra-adrenal tumors (paragangliomas),
some genetic mutations (for example, SDHB), and larger tumorscan be associated with higher risk of metastatic behavior.
This doesn’t mean “doom,” but it does influence how intensively someone is monitored.

Symptoms: The Classic Signs (and the Sneaky Ones)

Pheochromocytoma symptoms often come from catecholamine surges. Many people don’t have a constant “always on” symptom list.
Instead, they get episodessometimes called spells or paroxysms.

The “classic cluster”

A well-known symptom trio often described includes:

• Headache (often severe)
• Heavy sweating
• Palpitations or a fast, pounding heartbeat

Add high blood pressurewhich may be persistent or episodicand you get the picture most clinicians look for.
Some people describe the feeling as a panic attack that arrives without an invitation and refuses to RSVP “maybe.”

Other common symptoms

• Tremor or shakiness
• Pale skin (pallor)
• Anxiety, sudden fear, or a sense of doom
• Shortness of breath
• Dizziness/lightheadedness, sometimes when standing
• Chest discomfort (always take this seriously)
• Weight loss or appetite changes
• Constipation
• Heat intolerance or feeling “overheated”

Symptoms can be absent

Some tumors don’t produce much extra hormone (or do so unpredictably). In those cases, pheochromocytoma may be found incidentally on imaging done for another reason.
That can be frustrating (“Wait, I have a tumor and my only symptom is… none?”), but it’s a known possibility.

What Triggers a Spell? (Why Symptoms Can Seem Random)

Spells may occur without a clear trigger, but multiple reputable medical sources describe triggers that can provoke symptom surges.
Commonly cited triggers include:

• Hard physical activity
• Injury or physical stress
• Emotional stress (not always, but sometimes)
• Pregnancy/childbirth
• Anesthesia and surgery (especially if the tumor isn’t recognized and properly managed beforehand)
• Foods high in tyramine (often aged/fermented/pickled foods like certain cheeses, cured meats, and some wines/beer)
• Certain medications that can influence catecholamine release or blood pressure regulation

Here’s a concrete example: imagine someone who gets pounding headaches, drenching sweats, and a racing heartbeat
only after intense workoutsor after a big celebratory charcuterie board night (aged cheeses, cured meats, the whole villain lineup).
On separate days, they may feel fine. That patternepisodes tied to triggerscan be a helpful clue.

Why Pheochromocytoma Is Often Misread as “Just Anxiety”

The overlap is real. Catecholamine surges can create symptoms that look like panic attacks: rapid heartbeat, sweating, trembling, and intense fear.
The difference is that pheochromocytoma is a physical hormone-release problemso episodes may come with
significant blood pressure spikes and may occur in settings that aren’t emotionally stressful.

It can also mimic migraines, thyroid problems, medication side effects, sleep deprivation, or “too much caffeine.”
The key is not to self-diagnose, but to notice: Are symptoms episodic? Do they cluster? Do they come with hypertension?

When Symptoms Become an Emergency

Because catecholamine surges can strain the cardiovascular system, there are times when you should seek urgent careespecially if symptoms are severe or new.
Consider emergency evaluation for:

• Very high blood pressure with severe headache, confusion, or neurologic symptoms
• Chest pain, fainting, or severe shortness of breath
• Severe, persistent palpitations or a racing heart that won’t settle
• Any “worst-ever” symptom pattern that feels dangerous or unusual for you

This isn’t meant to scare youit’s meant to be practical. Pheochromocytoma is rare, but hypertensive crises are not something to “walk off.”

How Clinicians Confirm the Suspicion (Briefly)

The hallmark of diagnosis is demonstrating elevated catecholamine byproductsmost commonly through
plasma free metanephrines or urinary fractionated metanephrines. These tests are sensitive, but interpretation matters:
medications, stress, and collection conditions can affect results, which is why clinicians may give specific prep instructions.

If tests suggest a tumor, imaging (often CT or MRI) helps locate it. Because genetic syndromes are common enough to matter,
many guidelines recommend considering genetic evaluation after diagnosis to guide follow-up and family screening.

Bottom Line

Pheochromocytoma is rare, but it has a recognizable personality: episodes of “fight-or-flight” symptoms that may include
high blood pressure, pounding heartbeats, headaches, sweating, tremor, and anxiety-like sensationssometimes triggered by exertion,
anesthesia/surgery, or tyramine-rich foods. The biggest risk factors are genetic and syndrome-related (MEN2/RET, VHL, NF1, SDHx and other PPGL-related genes).

If your symptoms are episodic, intense, and paired with unexplained hypertensionespecially if there’s a family history of related syndromesbring it up with a clinician.
The goal isn’t to label yourself with a rare tumor; it’s to make sure a treatable cause of dangerous blood pressure swings isn’t missed.

Experiences: What Living With (or Suspecting) Pheochromocytoma Can Feel Like

Because pheochromocytoma is uncommon, many people describe a “diagnostic detour” before anyone thinks to test for it. A typical story begins with
symptoms that come and go: maybe weeks of feeling fine, then a sudden episode of pounding heartbeat, sweating through a shirt, and a headache that feels
like your skull is trying to file a complaint. By the time you’re sitting in a clinic, the spell has passed. Vitals might look normalor just mildly off.
That’s when people often hear some variation of: “Could be stress.” Sometimes it is. But for pheochromocytoma, the timing can be misleading, because the
body’s hormone surge doesn’t always stick around long enough to be caught casually.

Another commonly shared experience is confusion about triggers. Some people notice spells after exercise, after lifting something heavy, or during a painful injury.
Others notice a pattern around certain foodsespecially aged or fermented itemswhile plenty of people can’t connect the dots at all. That uncertainty can create its
own stress loop: “Is my body going to do that thing again in the grocery store aisle?” For students and working adults, unpredictability can be the hardest part.
People may start avoiding activities they love (sports, travel, even social events) because they’re worried a spell will show up uninvited.

Once pheochromocytoma becomes a real possibility, the experience often shifts from confusion to logistics. Testing for metanephrines can involve careful instructions
about timing, posture, and avoiding certain medications or substancesdetails that can feel picky until you realize they’re trying to prevent a false alarm (or a missed signal).
Imaging adds another layer: waiting for results can be emotionally intense, especially when symptoms have already made you feel like your body isn’t fully under your control.

People who move toward surgery often describe the pre-op phase as surprisingly important. It’s not usually “find tumor, remove tumor, done.”
Clinicians often use medications (commonly alpha-blocking drugs, sometimes followed by beta-blockers) to reduce the risk of dangerous blood pressure swings during anesthesia
and tumor handling. Patients sometimes say this preparation period is when they finally feel taken seriouslybecause the plan acknowledges what their body has been doing.
It can also be when family members begin asking the big questions: “Is this genetic? Should we get tested?” For hereditary syndromes, genetic counseling can bring both relief
(answers!) and responsibility (screening plans, family conversations, and follow-up).

After treatment, many people describe a “quieting” of their bodyfewer surges, more stable blood pressure, less of that sudden adrenaline-rush feeling.
But recovery can still be a process. Some people need time for blood pressure medications to be adjusted. Others are surprised by how emotionally draining it was to live with
unpredictable spells; once the physical danger is reduced, the nervous system can take a while to stop bracing for the next episode. Support groups and patient organizations can be
helpful herenot because they replace medical care, but because it’s easier to cope when you’re not the only person who’s heard, “It’s probably just anxiety,” and later discovered it wasn’t.

If you’re reading this because you suspect pheochromocytoma, the most common “experience-based” advice patients share is simple:
track episodes (what happened, how long it lasted, what you ate, what you were doing) and bring that pattern to a clinician. Not to prove anythingbut to help the right person
connect the dots faster. And if you already have a diagnosis, many people find it empowering to learn the language of their condition:
adrenal medulla, catecholamines, paraganglioma, metanephrines, genetic syndromes. Knowledge doesn’t fix everything, but it turns a mysterious problem into something
that can be tested, treated, and monitored with a plan.