Stomach
Pulsating lump in the abdomen
A throbbing or pulsating feeling, or a visible lump, in the centre of the tummy that beats in time with the heart — which can be a normal pulse felt through the body wall, but may signal a swelling of the main artery (an aneurysm) that needs urgent attention if it causes sudden severe pain or collapse.
Education and reference only. This explains the common causes of pulsating lump in the abdomen and the warning signs that need urgent help, in plain language — it is not a diagnosis or a substitute for advice from a clinician. If you feel very unwell or are worried, seek medical help.
Quick answer
What is pulsating lump in the abdomen?
A pulsating sensation in the abdomen is the feeling of a beat, in time with the heartbeat, somewhere in the middle of the tummy. In slim people, and especially when lying down, this can simply be the normal pulse of the body's main artery, the aorta, felt through a thin abdominal wall — entirely harmless.
- Get urgent help: Call 999 immediately for sudden severe tummy or back pain with a pulsating lump, feeling faint, sweating or collapse — this may be a burst aneurysm. Call 999 if you suddenly feel very unwell, grey, clammy or are losing consciousness alongside a pulsating abdominal mass.
- Self-care: A pulsating lump in the abdomen is not something to manage with self-care, because the key concern — a swelling of the main artery — needs proper assessment and, if confirmed, specialist monitoring or treatment.
About pulsating lump in the abdomen
A pulsating sensation in the abdomen is the feeling of a beat, in time with the heartbeat, somewhere in the middle of the tummy. In slim people, and especially when lying down, this can simply be the normal pulse of the body's main artery, the aorta, felt through a thin abdominal wall — entirely harmless. Sometimes, though, a persistent pulsating lump reflects a swelling of the aorta called an abdominal aortic aneurysm, where the artery wall weakens and balloons outward. This usually causes no symptoms and is often found by chance, but it carries a risk of bursting, which is life-threatening. The risk is higher in older people, in smokers and in those with raised blood pressure, narrowed arteries elsewhere or high cholesterol. A burst or about-to-burst aneurysm announces itself with sudden severe tummy or back pain, a pulsating lump and feeling faint or collapsing — and that is a 999 emergency.
When to get help
Call 999 or go to A&E if pulsating lump in the abdomen comes with any of these warning signs:
- Call 999 immediately for sudden severe tummy or back pain with a pulsating lump, feeling faint, sweating or collapse — this may be a burst aneurysm.
- Call 999 if you suddenly feel very unwell, grey, clammy or are losing consciousness alongside a pulsating abdominal mass.
- Seek urgent same-day assessment if you can feel a new, persistent pulsating lump in your tummy, even without pain.
- Seek urgent help for sudden severe pain spreading to the back or groin with a known or suspected aneurysm.
- See your doctor promptly if a pulsating lump grows, becomes tender, or comes with new abdominal or back discomfort.
When to see a doctor
A faint pulse felt in the tummy in a slim person lying down is usually the normal aorta and not a worry, but a persistent, definite pulsating lump should be assessed promptly so an aneurysm can be checked for, particularly if you are older, smoke or have high blood pressure or cholesterol. Arrange to be seen urgently — the same day — for any new pulsating mass you can feel, even without pain. Treat as a 999 emergency sudden severe tummy or back pain with a pulsating lump, feeling faint, sweating or collapse, as this may mean the aneurysm has burst and needs immediate care.
Not sure how urgent it is? It is always OK to call NHS 111 for advice, day or night.
What can cause it
Common causes of pulsating lump in the abdomen
Pulsating lump in the abdomen has many possible causes. Each links to a full, plain-language guide to that condition — what it is, how it's treated and when to seek help.
What helps
Self-care and what you can do
A pulsating lump in the abdomen is not something to manage with self-care, because the key concern — a swelling of the main artery — needs proper assessment and, if confirmed, specialist monitoring or treatment. The most useful thing you can do is protect your arteries while you arrange to be seen: do not smoke, as smoking is the single biggest risk factor for an aneurysm forming and bursting, keep your blood pressure and cholesterol well controlled through the advice you have been given, stay active within your limits and eat a balanced diet. If an aneurysm has been found and is being watched, attend your scans and reviews without fail. Learn the emergency warning signs so you can act immediately, and make sure those around you know them too.
Answers
Pulsating lump in the abdomen: frequently asked questions
Is a pulse in my tummy always serious?
Not always. In slim people lying down, the normal pulse of the main artery can be felt through the tummy wall and is harmless. But a persistent, definite pulsating lump should be checked promptly, as it can mean a swelling of the artery.
What is an abdominal aortic aneurysm?
It is a swelling of the body's main artery, the aorta, where the wall weakens and balloons outward in the tummy. It usually causes no symptoms but can burst, which is life-threatening, so a suspected aneurysm needs proper assessment and monitoring.
What are the emergency signs of a burst aneurysm?
Sudden severe tummy or back pain with a pulsating lump, feeling faint, sweating or collapsing. This is a 999 emergency — call immediately, as a burst aneurysm is life-threatening and needs urgent hospital treatment.
Who is at higher risk of an aortic aneurysm?
Older people, smokers and those with high blood pressure, high cholesterol or narrowed arteries elsewhere are at greater risk. Not smoking and keeping blood pressure and cholesterol well controlled help protect the artery wall.
Sources
Where this is drawn from
- NICE CKS: Abdominal aortic aneurysm.
- Circulation Foundation: abdominal aortic aneurysm.
Related symptoms
Tell us what you need. We'll route it to the right expert.
Request a proposal, book a scoping call, or speak to our team directly.