Lymphoma is a type of blood cancer that develops in the lymphatic system, an important part of the body’s immune system. It affects lymphocytes, a type of white blood cell that helps the body fight infections. The condition can develop in lymph nodes and other parts of the body, including the spleen and bone marrow.
Some forms grow slowly, while others can progress quickly and require prompt treatment. Recognising symptoms, understanding the different types and receiving an accurate diagnosis can help patients access appropriate care.
In this guide, we’ll explain what lymphoma is, its common types, possible causes, warning signs, stages, diagnostic tests and available treatment options.
What Is Lymphoma?
The lymphatic system consists of lymph nodes, lymph vessels, the spleen, the thymus and other tissues that support immune function. It transports lymph fluid and helps the body identify and fight infections.
Lymphoma develops when lymphocytes grow abnormally and multiply uncontrollably. These abnormal cells may accumulate in lymph nodes or other organs, affecting their normal function.
Although lymphoma cancer is sometimes used to describe the condition, lymphoma is a specific category of cancer rather than a single disease. Its behaviour and treatment depend on the type of lymphocyte involved, how quickly the cells grow and where the disease is located.
What Are the Types of Lymphoma?
There are two main categories: Hodgkin lymphoma and non-Hodgkin lymphoma. Each includes several subtypes with different characteristics and treatment requirements.
1. Hodgkin Lymphoma
Hodgkin lymphoma is characterised by the presence of abnormal cells called Reed–Sternberg cells in the affected tissue. It can occur at different ages, although certain age groups have a higher incidence.
Common features include swollen lymph nodes, fever, night sweats and unexplained weight loss. Treatment often involves chemotherapy, sometimes combined with radiotherapy, targeted medicines or immunotherapy.
Many patients respond well to treatment, and the condition can often be cured, particularly when diagnosed and managed appropriately.
2. Non-Hodgkin Lymphoma
Non-Hodgkin lymphoma includes a broad group of cancers involving lymphocytes. These may arise from B cells or T cells and can behave differently from one subtype to another.
Some forms grow slowly and may not require immediate treatment, while aggressive forms can progress rapidly and need prompt medical attention.
Examples include diffuse large B-cell lymphoma, follicular lymphoma, mantle cell lymphoma and Burkitt lymphoma. Treatment is selected according to the specific subtype, stage, symptoms and the patient’s overall health.
What Causes Lymphoma?
The exact reason lymphoma develops is not always known. It generally begins when genetic changes cause lymphocytes to grow or survive abnormally.
Several factors may increase the risk, although having a risk factor does not mean a person will necessarily develop the disease.
Possible lymphoma causes and associated risk factors include:
- Age: The risk of certain subtypes increases with age, although the disease can also affect children and younger adults.
- Weakened immune system: People with certain immune deficiencies or those taking medicines that suppress immunity may have a higher risk.
- Infections: Some infections, including Epstein–Barr virus and Helicobacter pylori, are associated with particular subtypes.
- Autoimmune conditions: Certain autoimmune diseases are linked with an increased risk.
- Family history: Having a close relative with lymphoma may be associated with a higher risk, but most cases are not directly inherited.
In many cases, no clear cause can be identified. Lymphoma is not contagious, and having it does not mean that a person has done anything to cause the disease.
What Are the Symptoms of Lymphoma?
The symptoms depend on where the disease develops and how quickly it progresses. Some people initially notice a lump, while others experience general symptoms that resemble an infection.
Common lymphoma symptoms include:
- Painless swelling in the neck, armpit or groin
- Persistent or unexplained fever
- Heavy night sweats
- Unintentional weight loss
- Ongoing fatigue or weakness
- Persistent itching
- Shortness of breath or coughing if enlarged lymph nodes affect the chest
- Abdominal discomfort or swelling if internal organs or lymph nodes are affected
These symptoms can also occur with less serious conditions, such as infections. However, persistent, unexplained or worsening symptoms should be assessed by a healthcare professional. A swollen lymph node alone does not confirm lymphoma.
How Is Lymphoma Diagnosed?
Diagnosis involves identifying abnormal cells, determining the specific subtype and assessing whether the disease has spread. Doctors consider the patient’s symptoms, medical history and examination findings before recommending tests.
Common Diagnostic Tests
1. Physical examination
The doctor checks for enlarged lymph nodes and may examine the abdomen for swelling of the spleen or liver. Medical history and associated symptoms are also reviewed.
2. Blood tests
A complete blood count (CBC) measures red blood cells, white blood cells and platelets. Other blood tests may assess organ function and levels of substances that help doctors evaluate the disease. Blood tests alone cannot confirm most lymphomas.
3. Lymph node biopsy
A biopsy involves removing a sample of tissue from a suspicious lymph node or another affected area. A pathologist examines the cells to establish whether lymphoma is present and identify its subtype. This is a key part of diagnosis.
4. Imaging tests
CT and PET-CT scans can help identify affected lymph nodes and organs and assess the extent of disease. The choice of imaging depends on the suspected subtype and clinical circumstances.
5. Bone marrow examination
In selected cases, doctors may recommend a bone marrow biopsy to determine whether the disease has affected the bone marrow.
The results help the specialist develop an individualised treatment plan.
What Are the Stages of Lymphoma?
Doctors use lymphoma stages to describe how extensively the disease has spread. Staging helps guide treatment decisions and estimate the likely course of the disease.
The commonly used stages are:
- Stage I: One lymph node region or one localised lymphatic site is affected.
- Stage II: Two or more lymph node regions on the same side of the diaphragm are affected.
- Stage III: Lymph node regions on both sides of the diaphragm are involved.
- Stage IV: The disease has spread to one or more organs outside the lymphatic system, such as the bone marrow or liver.
Staging details can vary according to the subtype and the classification system used. A higher stage does not automatically mean that treatment will be unsuccessful. The subtype, growth rate, overall health and response to treatment are also important.
What Are the Treatment Options for Lymphoma?
Lymphoma treatment depends on the subtype, stage, growth rate, symptoms, previous treatment and the patient’s general health. A haematologist or oncology team determines the most suitable approach.
Common options include:
- Chemotherapy: Uses medicines to destroy cancer cells or prevent them from multiplying. It may be given alone or with other treatments.
- Radiotherapy: Uses targeted radiation to treat affected areas, particularly in selected localised cases.
- Immunotherapy: Helps the immune system recognise or attack cancer cells. The medicines used depend on the subtype.
- Targeted therapy: Acts on specific proteins or pathways involved in cancer-cell growth.
- Stem cell transplant: May be considered for selected patients, including some whose disease returns or does not respond adequately to initial treatment.
- Active monitoring: Some slow-growing forms may be monitored closely before treatment begins, provided the specialist considers this safe.
Not every patient needs every treatment. Some forms can be cured, while others can be controlled for extended periods. Regular follow-up is important to assess treatment response, manage side effects and identify any recurrence.
When Should You See a Haematologist?
Consult a healthcare professional if you notice persistent, unexplained swollen lymph nodes, recurring fever, heavy night sweats, unexplained weight loss or ongoing fatigue. Seek prompt assessment if symptoms worsen or are accompanied by significant breathing difficulties.
A haematologist specialises in blood disorders and blood cancers and can arrange appropriate investigations or refer you to an oncology team. Early medical assessment helps clarify the cause of symptoms and avoids unnecessary delays if specialist treatment is needed.
Final Thoughts
Lymphoma includes several types of blood cancer, each with its own pattern of progression, diagnostic requirements and treatment options. Recognising warning signs, obtaining an accurate tissue diagnosis and understanding the stage of disease help doctors choose appropriate care. Many patients benefit from modern treatments, although outcomes vary according to the subtype and individual circumstances.
In Pakistan, the National Institute of Blood Disease & Bone Marrow Transplantation (NIBD) provides specialised haematology and oncology services, including diagnostic and treatment options for Hodgkin and non-Hodgkin lymphomas. Patients can consult a specialist to discuss their symptoms, test results and appropriate next steps.
FAQs
1. Is lymphoma a type of blood cancer?
Yes. Lymphoma is a blood cancer that develops in lymphocytes, which are white blood cells involved in immune function. It commonly affects lymph nodes but can also involve other tissues and organs.
2. What are the most common signs of lymphoma?
Common signs include painless swollen lymph nodes, unexplained fever, night sweats, weight loss, fatigue and persistent itching. These symptoms can have other causes, so medical assessment is important.
3. What is the difference between Hodgkin and non-Hodgkin lymphoma?
Hodgkin lymphoma is identified by characteristic Reed–Sternberg cells in the affected tissue. Non-Hodgkin lymphoma covers a wider group of lymphocyte cancers with different subtypes and patterns of progression.
4. Can lymphoma be cured?
Some forms, including many cases of Hodgkin lymphoma, can often be cured. Other types may be controlled for long periods. The outlook depends on the subtype, stage, response to treatment and overall health.
5. How is lymphoma confirmed?
A tissue biopsy is usually essential to confirm the diagnosis and identify the subtype. Blood tests and imaging scans provide additional information, while other investigations may be needed to determine the stage.
6. Does everyone with lymphoma need chemotherapy?
No. Treatment depends on the specific type and how it behaves. Some patients need chemotherapy or combined treatments, while selected people with slow-growing disease may be monitored closely before treatment begins.
