Medical Oncologist
CION Cancer Clinics
Why does liver disease cause varices? | CION Cancer Clinics
A scarred liver slows the blood flowing through it, so pressure builds in the portal vein that feeds it. Blood then takes detours through thin veins in the food pipe and stomach, which swell into varices and can burst. This page explains how that happens, what raises the risk in liver cancer, and why vomiting blood or black stools means going to hospital today. At CION Cancer Clinics, our team supports patients and families through symptoms, follow-up and life during and after treatment.
NG
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
17+specialists on panel
15,000+patients treated
35+centres across Telangana & AP
4.8★ / 800+Google rating
On this page
- Why does a damaged liver cause swollen veins in the food pipe?
- What can raise the pressure in the portal vein?
- How does high pressure turn into a bleed?
- What do the words on the scan or endoscopy report mean?
- What do families often get wrong about varices?
- What can this page not tell you?
- Common questions about why varices form
The short answer
Why does a damaged liver cause swollen veins in the food pipe?
A scarred liver blocks the blood that normally flows through it, so the pressure behind it rises. That blood looks for another way back to the heart, and some of the detours run through thin veins in the food pipe and stomach, which swell up. Those swollen veins are called varices.
The road that gets blocked
Blood from your gut, spleen and pancreas does not go straight to the heart. It first travels through one large vein, the portal vein, into the liver, which cleans and processes it. In a healthy liver this blood passes through easily. In cirrhosis, meaning a liver that has become stiff and scarred, the blood has to push through. The pressure in the portal vein climbs. Doctors call this portal hypertension. It is a different thing from ordinary high blood pressure in the arm.
Why the food pipe takes the strain
Small veins at the lower end of the food pipe connect the portal system to the normal veins that drain to the heart. They were never built to carry much. When the main road is jammed, traffic floods these side lanes and stretches them thin. A stretched vein with thin walls can burst, and that bleed can be heavy and sudden.
Varices themselves cause no pain or symptoms. Most people only learn they have them from an endoscopy, or from a bleed.
!
Call an ambulance or go to hospital today
If someone with liver disease or liver cancer vomits blood, vomits something that looks like coffee grounds, passes black sticky stools, or suddenly turns pale, sweaty or faint, treat it as an emergency. Go to the nearest hospital with an emergency department now, by ambulance if you can. Do not wait to see if it settles, and do not travel to a distant city first. Tell the staff the person has cirrhosis or a liver tumour, because the treatment for a variceal bleed is different. Read more on vomiting blood as an emergency.
Not sure whether this applies to you?
Ask an oncologistMore than one cause
What can raise the pressure in the portal vein?
Cirrhosis is the usual reason. In people with liver cancer, the tumour itself can add to the problem.
Cirrhosis
Scar tissue from hepatitis B or C, alcohol or fatty liver disease squeezes the small channels inside the liver. This is the most common cause of varices. Risk factors are not a fault, and the cause does not change how the veins are treated.
A tumour pressing on or growing into the portal vein
Liver cancer can grow into the portal vein or press on it from outside. Pressure can then rise quickly, even in a liver that was coping before. See portal hypertension caused by the tumour.
A clot in the portal vein
A blood clot can block the vein with or without cancer. Your scan report may say portal vein thrombosis. Your team will work out whether the blockage is clot or tumour, because the plan differs.
Less common causes
- Blocked veins leaving the liver (Budd-Chiari syndrome)
- Some infections and conditions that scar the liver's blood vessels
- Heart conditions that back blood up into the liver
Step by step
How does high pressure turn into a bleed?
-
The liver stiffens
Long-standing injury lays down scar tissue. The liver can still do much of its work, and the person may feel well for years.
-
Pressure in the portal vein rises
Blood backs up. The spleen often swells, which can pull down the platelet count on a blood test. That low platelet count is one clue doctors use. Read about an enlarged spleen and low platelets.
-
Detour veins open up
Side veins in the food pipe, the top of the stomach and around the navel start to carry blood they were not designed for. They widen slowly over months or years.
-
The veins grow and their walls thin
Bigger varices with red marks on the surface, seen at endoscopy, are the ones more likely to bleed. Worse liver function also raises the risk.
-
A vein can burst
Without warning, a stretched vein can tear. Because the pressure behind it is high, the bleed can be large. This is why finding varices early, and treating the large ones, matters so much.
On your report
What do the words on the scan or endoscopy report mean?
- Portal hypertension
- High pressure in the vein that carries blood from the gut into the liver. It is the root problem behind varices and often behind fluid in the abdomen too.
- Oesophageal varices
- Swollen veins in the lower food pipe. These are the ones most often checked and treated.
- Gastric varices
- Swollen veins in the stomach. They are handled a little differently. See stomach varices.
- Splenomegaly
- An enlarged spleen. On an ultrasound it is often the first hint that pressure is high.
- Collaterals
- The detour veins themselves, sometimes visible on a CT scan around the stomach or spleen.
- Red wale signs
- Red streaks on the surface of a varix seen at endoscopy. They suggest the wall is thin and the bleeding risk is higher.
Leave a number, we will call you
One field. No form to fill in, and no charge for the call.
Commonly believed
What do families often get wrong about varices?
"He feels fine, so the veins cannot be a problem."
Varices give no warning. A person can look and feel well right up to the moment of a bleed. That is why doctors check for them with an endoscopy instead of waiting for symptoms.
"Vomiting blood is from acidity or a tear from coughing."
In someone with cirrhosis or liver cancer, vomiting blood has to be treated as a variceal bleed until a doctor proves otherwise. Go to hospital the same day. Home remedies and antacids lose time.
"Varices mean the cancer has spread."
Usually they come from the cirrhosis, which was often there before the cancer. A tumour can make them worse, but finding varices does not by itself tell you the stage of the cancer.
"Once the veins are tied off, the problem is gone."
Banding treats the veins you can see. The high pressure behind them remains, so new varices can form. Regular repeat checks and any medicine prescribed are part of the plan, which is explained on preventing a second bleed.
Being straight with you
What can this page not tell you?
It cannot tell you whether you have varices, how large they are, or how likely they are to bleed. Only an endoscopy shows the veins directly, and a hepatologist or gastroenterologist reads it alongside your blood tests, scans and liver function. CION arranges endoscopy and banding through accredited partner hospitals and hepatologists, and the CION tumour board takes the result into account when planning cancer treatment. See who needs an endoscopy to check for varices.
Who this does not apply to
If your liver is healthy and the cancer in it spread from another organ, such as the bowel or breast, varices are uncommon. That situation is a secondary liver cancer and is covered on its own pages. This page is for people with cirrhosis, primary liver cancer, or a tumour affecting the portal vein.
It cannot replace a plan
Whether you need a beta-blocker tablet, banding, or simply a repeat check later depends on your own findings. Ask your team which applies to you, and what to do if bleeding starts.
Write down the nearest hospital with an emergency department and keep it on the fridge. In a bleed, minutes matter.Questions we are asked
Common questions about why varices form
Does everyone with cirrhosis get varices?
No. Many people with cirrhosis have no varices when they are first checked, and some never develop large ones. The risk grows as the liver scarring and pressure increase. That is why your doctor decides when to look, and how often to look again, based on your liver function and scan findings.
Can liver cancer cause varices without cirrhosis?
Yes, sometimes. A tumour that grows into or presses on the portal vein can raise the pressure even in a liver without much scarring. A clot in the portal vein can do the same. Your scan report will usually mention the portal vein, and your team can explain what it shows.
Is portal hypertension the same as high blood pressure?
No. Ordinary blood pressure is measured with a cuff on the arm. Portal hypertension is high pressure inside one vein that feeds the liver. A person can have normal or even low arm blood pressure and still have high portal pressure. The two are treated separately.
Do varices hurt?
No. Varices cause no pain, no burning and no difficulty swallowing in most people. That is what makes them dangerous. The first sign can be a sudden bleed, which is why doctors check with an endoscopy in people at risk instead of waiting for symptoms.
Can the pressure come down again?
Sometimes it improves. Treating the cause helps, for example controlling hepatitis B, treating hepatitis C or stopping alcohol. Some tablets lower the pressure too. A hepatologist decides which of these suits you. Read why stopping alcohol still helps.
Do cancer medicines affect the risk of bleeding?
Some can. Bevacizumab, used in one common liver cancer combination, can raise bleeding risk, so doctors usually want an endoscopy and any large varices treated before starting it. Your oncologist will explain what applies to your plan and why the order of steps matters.
Are painkillers safe with varices?
Some common painkillers, including aspirin and similar anti-inflammatory tablets, can raise the risk of bleeding and harm the kidneys in liver disease. Do not take them without asking your doctor. Check with the team before buying anything from a pharmacy, including herbal tonics.
Who should we call if we are worried?
For vomiting blood, black stools or fainting, go straight to the nearest emergency department. Do not call first. For questions about varices, endoscopy timing or how they fit with cancer treatment, call the CION helpline and someone will guide you to the right doctor.
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.
Medical Oncologist
Dr. C. Raghavendra Reddy
MBBS(Gold Medal), DNB(General Medicine), DM(Medical Oncology)(Gold Medal)
Medical Oncologist
Dr. Bharati Devi Gorantla
MBBS, MD(General Medicine), DM(Medical Oncology)(Adyar,Chennai), ECMO, MRCP SCE(UK)
Medical Oncologist
Dr. Owais Mohammed
MBBS, MD (General Medicine), DrNB (Medical Oncology), ECMO, MRCP SCE (Medical Oncology) (UK)
Medical Oncologist
Medical Oncologist
Surgical Oncologist
Dr. Muralidhar Muddusetty
MBBS (AIIMS), MS (Surgery) (AIIMS), DNB (Surgical Oncology), MRCS (Edinburgh)
Surgical Oncologist
Want a specific doctor for your case? Mention them when booking.
Book Free ConsultationBook an appointment with our specialist
Share your name and number — we'll call you back within 30 minutes to schedule your consultation.
Patient stories
Hear it from people we have treated
Every story is a video, in the patient's own words. Nothing here is a written testimonial.
Sources
- Merck Manual Consumer Version — Portal Hypertension
- Cleveland Clinic — Esophageal Varices: Symptoms, Causes & Treatment
- MedlinePlus — Bleeding esophageal varices
- NHS — Cirrhosis
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.
Keep reading
Related pages
Talk to us
Not sure whether you have been checked for varices?
Tell us what your scans and reports say, and we will help you understand whether an endoscopy is due and how it fits your cancer plan. One helpline serves every CION centre.