Hypersplenism is a condition where the spleen destroys blood cells too quickly and in too large a number. This leads to a drop in certain blood cells circulating in the body. Understanding hypersplenism — what causes it, how it shows up, and how it is treated — can help Canadians take the right steps toward better health. As always, speak with your family doctor or visit a walk-in clinic if you have concerns about your health.
What Is Hypersplenism?
The spleen is a small, fist-sized organ on the left side of your abdomen. It plays an important role in filtering your blood and supporting your immune system. Normally, it removes old or damaged blood cells at a steady, controlled rate.
In hypersplenism, however, the spleen becomes overactive. It starts removing blood cells far too quickly — including healthy ones. As a result, the number of certain blood cells in your bloodstream drops to unhealthy levels.
This condition is closely linked to splenomegaly, which simply means an enlarged spleen. When the spleen grows larger than normal, it tends to trap and destroy more blood cells than the body can replace. Therefore, hypersplenism and splenomegaly often go hand in hand, though they are not exactly the same thing.
For more background on how the spleen works, visit Mayo Clinic’s guide to enlarged spleen.
What Causes Hypersplenism?
Hypersplenism is not a disease on its own. Instead, it is a complication of other underlying conditions. Finding the root cause is the most important step in treating it.
Infectious Causes
Certain infections can cause the spleen to become inflamed and enlarged. Viral infections like mononucleosis (sometimes called “mono” or the “kissing disease”) are a common example. Bacterial infections such as endocarditis or tuberculosis can also be responsible. In some parts of the world, parasitic infections like malaria are a major cause.
Blood and Bone Marrow Disorders
Several blood-related conditions can trigger hypersplenism. These include haemolytic anaemia, where the body destroys red blood cells too early. Leukaemia and lymphoma — types of blood cancer — can also cause the spleen to enlarge and become overactive. In addition, certain inherited conditions affecting red blood cell shape, such as sickle cell disease or thalassemia, may play a role.
Portal Hypertension and Liver Disease
One of the most common causes in adults is portal hypertension. This is high blood pressure in the portal vein, which carries blood from your digestive organs to your liver. When blood backs up in this vein, it increases pressure in the spleen. Liver cirrhosis — often caused by long-term alcohol use or chronic hepatitis — is a leading reason for portal hypertension in Canada.
Other Causes
In some cases, tumours or cysts in the spleen can cause enlargement and overactivity. Autoimmune diseases, such as lupus or rheumatoid arthritis, may also be contributing factors. Furthermore, some storage disorders — rare genetic conditions where substances build up in organs — can cause the spleen to enlarge over time.
Which Blood Cells Are Affected?
Hypersplenism can affect all three main types of blood cells, but it tends to target some more than others. Understanding which cells are involved helps explain the wide range of symptoms people experience.
Neutrophils (White Blood Cells)
The most commonly affected white blood cells are neutrophils, also called polymorphonuclear neutrophils. These are your body’s first line of defence against bacterial infections. When their numbers drop — a condition called neutropenia — you become more vulnerable to infections that a healthy immune system would normally fight off easily.
Platelets
Platelets are tiny cells that help your blood clot when you are injured. Hypersplenism often causes a drop in platelet levels, known as thrombocytopenia. As a result, people may bruise easily, bleed longer after a cut, or notice tiny red dots under their skin called petechiae.
Red Blood Cells
When the spleen destroys red blood cells too quickly, it can lead to anaemia. Red blood cells carry oxygen throughout your body. Therefore, low levels can cause tiredness, weakness, pale skin, and shortness of breath during everyday activities.
Recognising the Symptoms of Hypersplenism
The symptoms of hypersplenism vary depending on which blood cells are most affected and what is causing the condition. Some people have mild symptoms, while others feel quite unwell.
Common signs to watch for include:
Fatigue and weakness — often linked to anaemia from low red blood cell counts
Frequent infections — caused by a drop in white blood cells, especially neutrophils
Easy bruising or prolonged bleeding — a sign of low platelet levels
A feeling of fullness or discomfort in the upper left abdomen — from the enlarged spleen pressing on nearby organs
Pale or yellowish skin — which may suggest anaemia or red blood cell breakdown
Unexplained weight loss — in some cases related to the underlying condition
It is worth noting that many of these symptoms overlap with other health conditions. For example, fatigue and frequent infections can have many causes. However, if you notice a combination of these signs, it is a good reason to speak with a healthcare provider.
You can learn more about general blood disorders at Healthline’s overview of hypersplenism.
How Is Hypersplenism Diagnosed?
Your family doctor will typically start with a full medical history and a physical exam. During the exam, they will feel your abdomen to check whether your spleen is enlarged. This is often the first clue.
Blood Tests
A complete blood count (CBC) is the key diagnostic test. This simple blood test measures the levels of red blood cells, white blood cells, and platelets. Low counts across one or more of these cell types can point strongly toward hypersplenism.
Additional blood tests may look for signs of infection, liver disease, or autoimmune conditions. In Canada, these tests are covered under most provincial health plans, so there is no reason to delay getting checked.
Imaging Tests
An ultrasound of the abdomen is usually ordered to confirm spleen enlargement and measure its size. In some cases, a CT scan or MRI provides a more detailed picture. These imaging tests help doctors understand the structure of the spleen and identify any underlying causes, such as liver disease or tumours.
Bone Marrow Biopsy
In certain situations, your doctor may recommend a bone marrow biopsy. This test checks whether your bone marrow is producing enough blood cells to compensate for what the spleen is destroying. It also helps rule out blood cancers like leukaemia or lymphoma.
Treatment Options for Hypersplenism
The treatment for hypersplenism focuses on the underlying cause. There is no single cure for hypersplenism itself. Instead, doctors aim to treat whatever condition is making the spleen overactive.
Treating the Underlying Condition
If an infection is the cause, antibiotics or antiviral medications may resolve the problem once the infection clears. For liver disease or portal hypertension, treatment may involve managing the liver condition, reducing alcohol intake, or using medications to lower portal vein pressure. In autoimmune conditions, immunosuppressive drugs may help calm the overactive immune response.
Managing Blood Cell Levels
While treating the root cause, doctors may also need to support your blood cell levels directly. For example, blood transfusions can temporarily boost red blood cell counts in severe anaemia. Platelet transfusions may be used before surgery or in cases of dangerous bleeding. Growth factor medications can also stimulate the bone marrow to produce more blood cells.
Splenectomy (Spleen Removal)
In severe or persistent cases, a surgeon may recommend removing the spleen. This procedure is called a splenectomy. It is usually considered when other treatments have not worked and blood cell counts remain dangerously low.
However, living without a spleen does carry risks. The spleen plays a role in fighting certain bacterial infections. Therefore, people who have had a splenectomy need vaccinations against specific bacteria and may need to take daily antibiotics long-term. Your specialist will walk you through all the risks and benefits before any decision is made.
Radiation Therapy
In rare cases where surgery is too risky — for example, in elderly patients or those with serious other health conditions — low-dose radiation to the spleen may help reduce its size and activity. This is not a common approach, but it remains an option for select patients.
For more information on treatment approaches, the Health Canada website offers reliable resources on navigating the Canadian healthcare system.
When to See a Doctor
You should see your family doctor if you notice ongoing fatigue, frequent infections, unusual bruising, or discomfort in your upper left abdomen. These symptoms may seem minor at first, but they can signal an underlying condition that needs attention.
If you do not have a family doctor, a walk-in clinic is a great starting point. Most provinces also have telehealth lines — such as Health811 in Ontario or 811 in British Columbia — where you can speak with a registered nurse any time, day or night.
Do not wait for symptoms to become severe. Early diagnosis of hypersplenism and its underlying cause leads to better outcomes. As with most health conditions, the sooner you seek care, the more treatment options are available to you.
Frequently Asked Questions
What is hypersplenism in simple terms?
Hypersplenism is a condition where the spleen becomes overactive and destroys blood cells too quickly. This leads to low levels of red blood cells, white blood cells, or platelets in the body. It is usually caused by an enlarged spleen linked to another underlying health condition.
What are the most common causes of hypersplenism?
The most common causes of hypersplenism include liver cirrhosis, portal hypertension, blood disorders like leukaemia or haemolytic anaemia, and certain infections. Autoimmune diseases can also trigger the condition. Treatment depends on identifying and managing the root cause.
Can hypersplenism be cured?
Hypersplenism itself does not have a standalone cure, but it can be effectively managed by treating the condition causing it. In some cases, treating the underlying disease resolves hypersplenism completely. When other treatments fail, removing the spleen — a splenectomy — may be recommended.
Is hypersplenism the same as an enlarged spleen?
No, hypersplenism and an enlarged spleen (splenomegaly) are related but not the same. An enlarged spleen can lead to hypersplenism, but not every enlarged spleen becomes overactive. Hypersplenism specifically refers to the overactive destruction of blood cells by the spleen.
What happens if hypersplenism is left untreated?
If hypersplenism goes untreated, dangerously low blood cell counts can develop over time. This can lead to severe anaemia, serious infections, or uncontrolled bleeding. It is important to see a doctor early so the underlying cause can be identified and managed promptly.
How is hypersplenism diagnosed in Canada?
In Canada, hypersplenism is typically diagnosed through a combination of a physical exam, a complete blood count (CBC), and imaging such as an abdominal ultrasound. These tests are covered under most provincial health plans. Your family doctor or a walk-in clinic can arrange the initial assessment.
Key Takeaways
Hypersplenism occurs when the spleen destroys blood cells too quickly, lowering their levels in the bloodstream.
It is almost always caused by an underlying condition, such as liver disease, a blood disorder, or a serious infection.
The most commonly affected cells are neutrophils (a type of white blood cell) and platelets, though red blood cells can be affected too.
Symptoms include fatigue, frequent infections, easy bruising, and left-sided abdominal discomfort.
Diagnosis involves blood tests and imaging, both of which are available through the Canadian public health system.
Treatment targets the underlying cause; in severe cases, spleen removal may be considered.
If you have concerns, speak with your family doctor or visit a walk-in clinic — early care leads to better outcomes.
This article is for informational purposes only and does not replace professional medical advice. Always consult a qualified healthcare provider for diagnosis and treatment tailored to your individual needs.
