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Carcinoid syndrome and liver involvement: flushing, diarrhoea and what to do | CION Cancer Clinics

Carcinoid syndrome is flushing, diarrhoea and sometimes wheezing caused by hormones from a neuroendocrine tumour. It usually starts once the tumour has spread to the liver, because the liver can no longer clear those hormones. Most flushing has ordinary causes. This page explains how the syndrome is confirmed, how it is controlled and which warning signs need hospital the same day. At CION Cancer Clinics in Hyderabad, our oncologists explain liver cancer in plain words and plan care around you and your family.

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Medically reviewed by Dr. Naresh GunduConsultant Medical Oncologist · MBBS, DNB (Internal Medicine), DM (Medical Oncology, AIIMS) · last reviewed October 2026, next review due October 2027
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The short answer

What is carcinoid syndrome, and why does the liver matter?

Carcinoid syndrome is a group of symptoms, mainly flushing and diarrhoea, caused by hormones released from a neuroendocrine tumour (NET). It usually appears once the tumour has spread to the liver, because the liver normally breaks these hormones down before they can reach the rest of the body.

Why the liver is the turning point

Blood from the bowel passes through the liver first. While a NET stays in the bowel, the liver quietly clears most of what it makes. Once tumour deposits sit inside the liver itself, their hormones go straight into the general circulation, and symptoms begin. That is why the syndrome is often the first clue that a NET has reached the liver.

Who this page is for

This page is for people with a confirmed or suspected NET, usually from the small bowel, who have flushing or diarrhoea. Flushing on its own is very common and is usually caused by menopause, heat, spicy food, alcohol or certain medicines, not by a tumour. If you have no NET diagnosis, start with your family doctor. For the tumour itself, read neuroendocrine tumours in the liver.

What people notice

What does carcinoid syndrome feel like?

Symptoms come and go, and many people have only one or two of them. They are often put down to something else for a long time.

Flushing

Sudden redness and warmth of the face, neck and upper chest, lasting from a minute or two to much longer. It can be set off by alcohol, large meals, stress or exercise.

Diarrhoea

Frequent, watery stools, often with cramping. Over time it can cause weight loss, tiredness and a shortage of vitamins and salts.

Wheezing or breathlessness

Some people wheeze during a flush, which can be mistaken for asthma. It settles as the flush settles.

Heart changes over time

Years of high hormone levels can thicken and stiffen the valves on the right side of the heart. This is called carcinoid heart disease.

Signs to mention

  • Swollen ankles
  • Breathlessness on stairs
  • Tiredness that keeps getting worse

Not sure whether this applies to you?

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When to go to hospital today

A flush that comes with dizziness, fainting, a very fast heartbeat, severe wheezing or confusion can be a carcinoid crisis. Go to hospital today and tell them the person has a neuroendocrine tumour. Diarrhoea that leaves someone unable to keep fluids down, passing very little urine or feeling faint also needs hospital the same day. Before any operation, biopsy, embolisation or scan with sedation, tell the team about the syndrome, so they can give medicine beforehand to prevent a crisis.

Finding out

How do doctors confirm carcinoid syndrome?

A urine or blood hormone test

The main test measures 5-HIAA, a breakdown product of serotonin, usually in urine collected over a full day. Some foods and medicines raise it, so you will be told what to avoid beforehand.

Scans of the liver and bowel

CT or MRI shows the liver deposits. A DOTA PET-CT shows where NET cells are and whether receptor-targeted medicines can work. CION arranges these through diagnostic partners.

A biopsy, if not already done

Tissue from one liver spot confirms the NET and gives its grade. The team must know about the syndrome first, so the biopsy is done safely.

A heart scan

An echocardiogram, an ultrasound of the heart, checks the valves. It is repeated during follow-up, because heart changes can develop slowly without symptoms.

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Controlling it

How is carcinoid syndrome treated?

Treatment What it does
Octreotide or lanreotide injections Block hormone release, easing flushing and diarrhoea for most people, and slow tumour growth
Telotristat tablets Added for diarrhoea that persists; not routinely available in India and may need import
Treating the liver deposits Surgery, embolisation or ablation reduce the amount of hormone-making tissue
PRRT with Lu-177 DOTATATE Targets receptor-positive tumour cells when the disease keeps growing
Diet and fluids Fewer triggers, replacing lost fluids, and checking vitamin levels

Commonly believed

What do families often get wrong about carcinoid syndrome?

"The flushing is just menopause or blood pressure."

Very often it is, which is why the syndrome is missed for a long time. In someone with a known NET, or with flushing plus diarrhoea and wheezing together, it deserves a proper test rather than a guess.

"Cutting out all food will stop the diarrhoea."

Starving makes weakness and weight loss worse. Smaller, regular meals, avoiding personal triggers and drinking enough fluid help more. A dietitian can check for missing vitamins, especially vitamin B3, which this condition can use up.

"If the symptoms are controlled, the tumour has gone."

Calmer symptoms mean the hormones are controlled. The tumour still needs regular scans, because the two do not always move together.

"The heart is fine because there is no chest pain."

Carcinoid heart disease usually causes swelling and breathlessness, not pain, and can be silent early on. That is why the heart scan is repeated.

Being straight with you

What this page cannot tell you

It cannot tell you whether your flushing or diarrhoea comes from a tumour. Most flushing and most diarrhoea have ordinary causes, and only tests can separate them. Please do not read this page and assume the worst, or assume the best.

It cannot set your treatment

The choice between injections, liver procedures and other medicines depends on the grade, the receptor scan, how much of the liver is involved and the state of the heart. At CION, medical oncologists plan and give the medicines, and the tumour board reviews the case. Procedures such as embolisation and PRRT are coordinated through accredited partners.

Who this does not apply to

NETs from the pancreas can release other hormones and cause different syndromes, covered on the pancreatic neuroendocrine tumour page. The evidence on some newer treatments for this syndrome is still limited, and your oncologist will say so plainly.

If symptoms change suddenly, call your team rather than waiting for the next appointment.

Questions we are asked

Common questions about carcinoid syndrome

Does carcinoid syndrome mean the cancer has spread?

Usually it means a NET from the bowel has reached the liver, because that is when hormones bypass the liver's filtering. It can rarely occur without liver spread, for example from some lung or ovarian NETs. Your scans, not the symptoms, decide the stage.

Is carcinoid syndrome dangerous?

The day-to-day symptoms are unpleasant rather than dangerous for most people, and they can usually be controlled. The serious risks are a carcinoid crisis around procedures, dehydration from severe diarrhoea and slow damage to the heart valves, which is why each is watched for.

Which foods should I avoid?

Common triggers are alcohol, very spicy food, large heavy meals and some aged or fermented foods. Triggers differ from person to person, so a simple diary of meals and flushes helps. Do not cut out whole food groups without speaking to a dietitian.

Are octreotide and lanreotide available in India?

Yes, both are available in India. They are given as injections, and many people have them at a day-care visit. Your oncologist will explain which form suits you and how often you will need it. Cost and insurance cover vary, so ask for a written estimate.

Why must I tell the doctor before a procedure?

Anaesthesia, surgery, biopsy and embolisation can squeeze a burst of hormones out of the tumour. That can drop blood pressure and trigger a crisis. Medicine given beforehand prevents most of these, but only if the team knows.

Can the heart damage be treated?

Yes. Water tablets ease swelling, and some people need a heart valve operation, planned with a cardiologist and cardiac surgeon. Controlling hormone levels well is the best way to protect the heart in the first place.

Will the symptoms ever stop?

For many people they become mild or occasional with treatment. Removing or shrinking liver deposits can reduce them further. They may return if the tumour grows, which is often an early sign that the plan needs reviewing.

Where should we start?

Bring every scan, biopsy report and any hormone test to a medical oncologist who sees NETs. The CION helpline can arrange a consultation and a tumour board review, and coordinate any tests still needed through partner centres.

Your Specialists

Meet CION's liver cancer specialists. Bring your scan reports and liver blood tests.

Our medical and surgical oncologists plan liver cancer care together, weighing the tumour and how well your liver works before choosing surgery, a liver-directed procedure or medicines.

Dr. Naresh Gundu
Medical Oncologist

Dr. Naresh Gundu

MBBS, DNB (Internal Medicine), DM (Medical Oncology)

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Dr. C. Raghavendra Reddy
Medical Oncologist

Dr. C. Raghavendra Reddy

MBBS(Gold Medal), DNB(General Medicine), DM(Medical Oncology)(Gold Medal)

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Dr. Bharati Devi Gorantla
Medical Oncologist

Dr. Bharati Devi Gorantla

MBBS, MD(General Medicine), DM(Medical Oncology)(Adyar,Chennai), ECMO, MRCP SCE(UK)

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Dr. Owais Mohammed
Medical Oncologist

Dr. Owais Mohammed

MBBS, MD (General Medicine), DrNB (Medical Oncology), ECMO, MRCP SCE (Medical Oncology) (UK)

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Dr. T. Raghavender Reddy
Medical Oncologist

Dr. T. Raghavender Reddy

MBBS, DM (Medical Oncology), MD (Radiation Oncology)

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Dr. N. Kiranmayee
Medical Oncologist

Dr. N. Kiranmayee

MBBS, DM (Medical Oncology), MD (Internal Medicine)

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Dr. Muralidhar Muddusetty
Surgical Oncologist

Dr. Muralidhar Muddusetty

MBBS (AIIMS), MS (Surgery) (AIIMS), DNB (Surgical Oncology), MRCS (Edinburgh)

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Dr. Mohammed  Imaduddin
Surgical Oncologist

Dr. Mohammed Imaduddin

M.B.B.S, MS (General Surgery), M.Ch (Surgical Oncology)

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Sources

  1. NHS — Neuroendocrine cancers
  2. Cancer Research UK — Secondary liver cancer
  3. National Cancer Institute — Metastatic Cancer: When Cancer Spreads

This page is general information, not a prescription. Do not change or stop any treatment based on what you read here. If anything is worrying you, contact your own treating team — or call our helpline and we will help you reach the right specialist.

Talk to us

Struggling to control flushing or diarrhoea?

Share your reports and we will arrange a review with a medical oncologist who treats neuroendocrine tumours. One helpline serves every CION centre.

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Where to find us

Our centres in and around Hyderabad

Addressed by landmark, because that is how this city navigates. One helpline books a consultation at any of these centres, and your team will tell you where each test and operation takes place.

CION Ameerpet

Beside Blue Fox Hotel, Satyam Theatre Road

Begumpet SR Nagar Punjagutta
CION Kukatpally

Opposite Big Bazaar, Mumbai Highway

KPHB JNTU Bharat Nagar
CION L.B. Nagar

Anu Arcade, next to L.B. Nagar Metro station

Vanasthalipuram Nagole Hayathnagar
CION Tolichowki

Inside Premier Hospital, Khader Bagh Road

Mehdipatnam Attapur Rethibowli
CION Masab Tank

Mahavir Hospital, AC Guards, Lakdikapul

Lakdikapul Khairatabad Basheer Bagh
CION Banjara Hills

Road No. 12

Jubilee Hills Madhapur Film Nagar
CION Kompally

Suchitra Circle, NH-44

Suchitra Circle Alwal Dundigal
CION Balanagar

Balanagar Main Road

Balanagar Fatehnagar Moosapet
CION Siddipet

Lohith Sai Hospital, Shivaji Nagar

Gajwel Husnabad Dubbaka
CION Sangareddy

X Roads, Pothreddipalle

Narayankhed Zaheerabad Patancheru
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