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Health condition · Clinically reviewed

Enlarged spleen, a sign to investigate, not a diagnosis on its own.

A palpable spleen is the body flagging that something else is going on. Careful history, targeted bloods and imaging almost always find the cause.

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Why trust this guide

  • 01

    Clinically reviewed

    Written by our editorial team and reviewed by a registered UK clinician before publication.

  • 02

    Sourced from guidance

    Checked against BSH, NICE and peer-reviewed sources you can see at the end.

  • 03

    Current for 2026

    Reflects modern UK haematology, hepatology and infectious-diseases practice.

Key facts

Enlarged spleen at a glance.

The essentials, in plain English. What splenomegaly is, why it matters and how UK doctors approach it.

  • What it is

    Splenomegaly is enlargement of the spleen beyond its normal 12 cm by 7 cm by 3 cm envelope. A normal spleen is not palpable below the left costal margin.

  • Sign, not diagnosis

    An enlarged spleen is a physical sign of an underlying problem, not a disease in its own right. The job is to find the cause.

  • Common causes

    Viral infection (Epstein Barr, hepatitis, HIV), portal hypertension from liver disease, and haematological conditions such as lymphoma, leukaemia and haemolytic anaemia.

  • Massive splenomegaly

    When the spleen exceeds 20 cm the differential narrows sharply to chronic myeloid leukaemia, myelofibrosis, malaria, kala azar, thalassaemia major, Gaucher disease and some lymphomas.

  • Hypersplenism

    An overactive spleen can trap blood cells and cause anaemia, low white cells and low platelets, sometimes independent of the original cause.

  • Rupture risk

    An enlarged spleen is fragile. Splenic rupture, especially after infectious mononucleosis, is a surgical emergency and a reason to avoid contact sport for three to four weeks.

Why this guide matters

Nine causes, one clear path.

Splenomegaly has a long differential. This guide organises it into causes you and your doctor can work through together, then explains what treatment usually looks like.

  • Infection, blood or liver

    Most enlarged spleens fall into one of three groups: infection, a haematological condition, or portal hypertension from chronic liver disease.

  • Massive splenomegaly narrows things

    When the spleen exceeds 20 cm the shortlist is small: chronic myeloid leukaemia, myelofibrosis, malaria, kala azar, thalassaemia major, Gaucher and some lymphomas.

  • Treat the cause, protect the patient

    Successful care means treating the underlying disease and, if the spleen is removed, protecting against overwhelming post-splenectomy infection for life.

How the diagnosis is made

From a palpable spleen to a named cause.

The steps a UK GP, haematologist or hepatologist will typically follow, in order, so you know what to expect and why each test is being done.

  1. 01

    Assessing

    History and travel review

    Recent infections, sore throat, fever, travel to malaria or leishmaniasis regions, alcohol, medications, family history of haematological or storage disease.

  2. 02

    Assessing

    Abdominal examination

    Palpation and percussion of the spleen, liver size, lymph nodes and stigmata of chronic liver disease such as spider naevi and ascites.

  3. 03

    Assessing

    First-line bloods

    Full blood count with film, reticulocytes, haptoglobin, LDH, coagulation, liver function, inflammatory markers and a monospot when mononucleosis is suspected.

  4. 04

    Confirming

    Ultrasound of the abdomen

    The first-line imaging test. Confirms and measures splenomegaly, screens for portal hypertension, focal lesions and liver architecture.

  5. 05

    Confirming

    Targeted serology and screens

    Epstein Barr virus, cytomegalovirus, HIV, hepatitis B and C, malaria films, brucella and leishmania where the travel history fits.

  6. 06

    Confirming

    Autoimmune and protein studies

    Antinuclear antibodies and rheumatology screen, immunoglobulins, serum protein electrophoresis and free light chains when infection is not the answer.

  7. 07

    Specialist

    Specialist imaging and biopsy

    Contrast CT or MRI, PET CT for lymphoma staging, bone marrow biopsy, flow cytometry and JAK2, CALR or MPL mutation testing under haematology.

Typical timeline: a first appointment to a working diagnosis in days to weeks, depending on the cause.

Symptoms

What splenomegaly can feel like.

Enlarged spleens are often silent. When symptoms do appear, they range from vague fullness under the ribs to fatigue, bleeding, fever and, rarely, sudden severe pain from rupture.

  • Often silent

    Many enlarged spleens are found incidentally on scans or examination and cause no symptoms at all.

  • Left upper quadrant fullness

    A dragging or dull ache under the left ribs, sometimes worse on inspiration or when lying on the left side.

  • Early satiety

    Feeling full after only a small meal because the enlarged spleen presses on the stomach.

  • Left shoulder pain

    Referred pain to the tip of the left shoulder, known as Kehr sign, can point to diaphragmatic irritation or rupture after trauma.

  • Anaemia and easy bruising

    Hypersplenism traps red cells, white cells and platelets, producing fatigue, bruising and a tendency to infection.

  • Systemic B symptoms

    Persistent fever, drenching night sweats and unintentional weight loss point towards lymphoma or chronic infection.

  • Signs of chronic liver disease

    Jaundice, spider naevi, palmar erythema and ascites suggest cirrhosis and portal hypertension as the driver.

  • Red flag - splenic rupture

    Sudden severe left-sided abdominal pain, dizziness or collapse, especially after a viral illness or minor trauma, needs emergency assessment.

Treatment

How enlarged spleen is managed in the UK.

Care follows the cause. Infection, liver disease and haematological conditions each have their own treatment pathway, with surgery and embolisation kept for selected cases.

  • Treat the underlying cause

    Splenomegaly is a sign. Successful care almost always starts with treating the infection, liver disease, haematological disorder or storage disease behind it.

  • Antiviral and antimicrobial care

    Supportive care for Epstein Barr virus, targeted antivirals for HIV or hepatitis, antimalarials, antiparasitics and antibiotics guided by the specific pathogen.

  • Haematology-led therapy

    Chemotherapy, targeted agents, immunotherapy or JAK inhibitors for leukaemias, lymphomas and myeloproliferative disorders under a specialist haematology team.

  • Portal hypertension management

    Treating cirrhosis, variceal surveillance, beta blockers, TIPS in selected cases and hepatology follow-up when liver disease is the driver.

  • Splenic artery embolisation

    A selective interventional radiology option that shrinks the spleen and reduces hypersplenism while avoiding full removal in carefully chosen cases.

  • Partial splenectomy

    Preserves some splenic immune function in specific paediatric and haematological indications, under specialist surgical care.

  • Total splenectomy

    Reserved for refractory hypersplenism, certain haematological conditions, splenic rupture or specific tumours. Always followed by lifelong infection precautions.

  • Post-splenectomy protection

    Pneumococcal, Hib, meningococcal and annual influenza vaccination, malaria prophylaxis for travel, lifelong penicillin cover and a medical alert card.

What this guide is based on

The sources behind every claim on this page.

UK national guidance and specialist society standards, current at the time of last review.

Key references

Guidelines and standards we relied on.

A quiet reminder

This guide is for information, not medical advice.

Your GP or specialist knows your history and can tell you which parts apply to you. If you are unwell or worried, get seen.

  • British Society for Haematology (BSH). Guidelines on splenectomy and splenic dysfunction.

  • NICE. Suspected cancer: recognition and referral (NG12) and haematological cancer guidance.

  • European Association for the Study of the Liver (EASL). Clinical practice guidelines on portal hypertension.

  • UK Health Security Agency (UKHSA). Vaccination of individuals with a poorly functioning spleen (Green Book).

Red flags

When splenomegaly needs urgent attention.

These features push splenomegaly out of the routine outpatient lane and into the same-day, urgent or emergency category.

  • Splenic rupture

    Sudden severe left upper quadrant pain, left shoulder tip pain, dizziness or collapse, especially after glandular fever or minor trauma. A surgical emergency.

  • B symptoms

    Persistent unexplained fever, drenching night sweats and weight loss of more than ten per cent in six months point towards lymphoma and need urgent haematology review.

  • Rapidly enlarging spleen

    A spleen that grows quickly over weeks, or reaches massive proportions, needs urgent specialist assessment for haematological malignancy or infection.

  • Pancytopenia

    Falling haemoglobin, white cells and platelets on the full blood count point towards hypersplenism, bone marrow disease or advanced liver disease.

  • Jaundice with splenomegaly

    Combined jaundice, splenomegaly and low haemoglobin suggests haemolytic anaemia or advanced liver disease and needs same-day review.

  • Contact-sport injury after glandular fever

    Any abdominal trauma in the three to four weeks after infectious mononucleosis needs urgent assessment for splenic rupture.

  • Fever after travel

    Fever with splenomegaly after travel to malarial or leishmaniasis regions is malaria until proven otherwise and needs same-day testing.

  • Post-splenectomy sepsis

    Any fever in a patient without a functioning spleen must be treated as potential overwhelming post-splenectomy infection and needs emergency antibiotics.

  • New lymphadenopathy

    New persistent lymph node enlargement alongside splenomegaly requires urgent haematology or two-week-wait referral.

Living with it

A manageable sign, with sensible precautions.

Four practical habits that reduce risk and keep treatment on track while your specialist team works on the underlying cause.

A quiet reminder

Small precautions prevent big problems.

An enlarged or absent spleen is not a life sentence. It is a reason to be a little more careful with contact sport, travel and febrile illness.

  1. 01 Sport

    Avoid contact sport when enlarged

    While the spleen is palpably enlarged, or for three to four weeks after glandular fever, avoid rugby, football, martial arts and other high-impact activity.

  2. 02 Travel

    Plan travel carefully

    If your spleen is small or absent, get pre-travel malaria prophylaxis, up-to-date vaccinations and a written plan for febrile illness abroad.

  3. 03 Infection

    Take infection seriously

    Sudden fever, rigors or feeling unwell warrant early medical review, especially after splenectomy or with hypersplenism.

  4. 04 Follow up

    Keep monitoring appointments

    Ultrasound surveillance, blood tests and specialist review are how doctors catch changes early and adjust treatment.

Frequently asked

Everything we get asked about enlarged spleen.

Quick answers on causes, symptoms, investigations and when surgery is really needed.

  • What is splenomegaly?

    Splenomegaly is enlargement of the spleen beyond its normal size of roughly 12 cm by 7 cm by 3 cm. A normal spleen is not felt below the left costal margin. It is a physical sign of an underlying condition rather than a disease in its own right.

  • What are the most common causes of an enlarged spleen?

    The commonest causes in UK practice are viral infection such as Epstein Barr glandular fever, portal hypertension from chronic liver disease, and haematological conditions including lymphoma, leukaemia and haemolytic anaemia. Travel-related infections and inflammatory conditions such as lupus also feature.

  • What symptoms should I watch for?

    Many enlarged spleens are silent. When symptoms appear they include a dragging discomfort under the left ribs, early satiety, left shoulder tip pain, fatigue, bruising and infection from low blood counts, and systemic features such as fever, night sweats and weight loss.

  • How is an enlarged spleen investigated?

    Assessment starts with a detailed history and examination, then blood tests including a full blood count and film, liver function, coagulation, autoimmune and infection screens. Abdominal ultrasound is the first-line imaging test, with CT, MRI, PET CT and bone marrow biopsy reserved for specialist work-up.

  • Is splenectomy always needed?

    No. Most people never need surgery. Splenectomy is reserved for specific haematological conditions, refractory hypersplenism, splenic rupture and certain tumours. Partial splenectomy and splenic artery embolisation are alternatives in carefully chosen cases.

  • What are the risks of losing the spleen?

    The main long-term risk is overwhelming post-splenectomy infection with encapsulated bacteria. UK guidance recommends pneumococcal, Hib, meningococcal and annual influenza vaccination, malaria prophylaxis for travel, lifelong penicillin cover and a medical alert card.

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