Lymphoma

What it is

Lymphoma is a cancer of lymphocytes in the lymphatic system, broadly divided into 2 main groups: Hodgkin and non-Hodgkin lymphoma. The single most important classification is whether the disease is Hodgkin lymphoma or non-Hodgkin lymphoma, because this strongly affects diagnosis, treatment, and outlook. Lymphoma starts when a B cell, T cell, or less often a natural killer (NK) cell acquires genetic changes that let it grow and survive abnormally. These cells can collect in lymph nodes, spleen, bone marrow, or other organs.

The lymphatic system is part of the immune system and includes lymph nodes, lymph vessels, spleen, thymus, tonsils, adenoids, and bone marrow. Lymphoma may present as a painless enlarged lymph node, but it can also cause fever, drenching night sweats, unexplained weight loss, fatigue, itching, chest symptoms, abdominal fullness, or low blood counts. Some lymphomas grow quickly and need urgent treatment; others are slow-growing and may be monitored for a time.

A simple way to group lymphoma is:

Main group	Key feature	Common examples
Hodgkin lymphoma	Usually identified by Reed-Sternberg cells on pathology	Classical Hodgkin lymphoma, nodular lymphocyte-predominant Hodgkin lymphoma
Non-Hodgkin lymphoma	Large and varied group without Reed-Sternberg cells	Diffuse large B-cell lymphoma, follicular lymphoma, mantle cell lymphoma, Burkitt lymphoma, peripheral T-cell lymphoma

In India, lymphoma care is usually led by a haemato-oncologist or medical oncologist, and diagnosis often requires review by an experienced haematopathology laboratory because subtype matters so much.

How it works

Lymphoma develops from clonal proliferation of lymphoid cells. In plain language, one abnormal lymphocyte gains mutations and then makes many copies of itself. These cells may avoid normal cell death, multiply too fast, and crowd out healthy immune and blood-forming cells.

The biology differs by subtype. Many non-Hodgkin lymphomas arise from B cells, while others arise from T cells or NK cells. Hodgkin lymphoma has a distinct pathology and pattern of spread. Some lymphomas are called indolent because they grow slowly, while others are aggressive because they grow rapidly but may still be highly treatable.

Lymphoma can begin in a lymph node or outside nodes, called extranodal disease. Sites can include the stomach, skin, brain, testis, bowel, or mediastinum. Bone marrow involvement may reduce normal blood cell production and lead to anaemia, infections, or bleeding.

Risk factors vary and do not explain every case. Depending on subtype, they can include older age, immune suppression, autoimmune disease, certain infections such as Epstein-Barr virus, HIV, hepatitis C, or Helicobacter pylori, and prior exposure to some treatments or chemicals. Most people with lymphoma do not have a single clear cause.

Diagnosis / how it's measured

Lymphoma cannot be diagnosed reliably from symptoms or a blood test alone. The core test is a tissue biopsy, ideally an excisional or incisional lymph node biopsy when feasible, because preserving tissue architecture helps pathologists classify the lymphoma correctly. Fine-needle aspiration alone is often not enough for a full first diagnosis.

Diagnosis usually includes:

1. History and physical exam
   • Enlarged lymph nodes, spleen, liver, skin lesions, fever, weight loss, night sweats
2. Biopsy and pathology
   • Microscopy, immunohistochemistry, flow cytometry, and sometimes molecular or cytogenetic tests
3. Blood tests
   • CBC, liver and kidney function, LDH, uric acid, viral screening, and other tests before treatment
4. Imaging
   • CT and often PET-CT for staging in many lymphoma types
5. Bone marrow biopsy
   • Used in selected cases depending on subtype and stage workup

Doctors also assess stage, which describes how far the lymphoma has spread, and whether B symptoms are present:

• Fever
• Drenching night sweats
• Unintentional weight loss

These features help guide treatment intensity and prognosis, but subtype is often even more important than stage.

Evidence and uses

Lymphoma is not one disease, so treatment is highly subtype-specific. Modern treatment can be very effective, and some lymphomas are curable. Others behave more like long-term chronic illnesses with periods of remission and relapse.

Common treatment approaches include:

Treatment approach	When it may be used
Active surveillance	Selected indolent lymphomas without symptoms or organ threat
Chemotherapy	Many Hodgkin and non-Hodgkin lymphomas
Immunotherapy	Often with monoclonal antibodies such as anti-CD20 drugs in B-cell lymphomas
Targeted therapy	Certain relapsed or genetically defined lymphomas
Radiation therapy	Localised disease or symptom control
Stem cell transplant	Selected relapsed or high-risk cases
CAR-T cell therapy	Some relapsed/refractory B-cell lymphomas after prior treatment

For suspected lymphoma, expert guidance stresses that obtaining the right biopsy early can prevent delays and misclassification. This matters because treatment for one subtype may be ineffective or inappropriate for another. For example, diffuse large B-cell lymphoma is usually treated promptly, while some follicular lymphomas may initially be observed.

Supportive care is also important. Patients may need infection prevention, fertility counseling before treatment, vaccination review, nutritional support, and management of treatment side effects. In India, access to PET-CT, transplant, and CAR-T varies by centre and cost, so treatment planning often includes practical discussions about availability and affordability.

There is no established role for Ayurveda or herbal remedies as a replacement for standard lymphoma treatment. Some supportive practices may help with general well-being, but they should not delay biopsy, staging, or cancer therapy. Evidence for herbal anticancer effects in humans is limited, and herb-drug interactions can be clinically important.

When to see a clinician

See a clinician promptly if you have a lymph node that stays enlarged for more than a few weeks, especially if it is firm, growing, or appears in the neck, armpit, or groin without a clear infection. Also seek medical review for unexplained fever, drenching night sweats, unintentional weight loss, persistent fatigue, itching, chest pain, shortness of breath, abdominal swelling, or repeated infections.

Urgent assessment is needed if there are pressure symptoms such as trouble breathing, facial swelling, severe pain, confusion, spinal symptoms, or rapidly enlarging nodes. People with HIV, transplant-related immune suppression, or prior lymphoma should have a lower threshold to seek care.

Limitations and open questions

Lymphoma is a broad label covering many biologically different cancers, so no single description fits every patient. Prognosis depends on subtype, stage, age, performance status, lab findings, and response to treatment. Even with modern pathology, some cases are difficult to classify and may need expert review.

Research is moving quickly in molecular profiling, minimal residual disease testing, bispecific antibodies, and cellular therapies. Even so, not every new test changes treatment today, and access may be uneven. Evidence is strongest for established diagnostic pathology and guideline-based therapy; newer biomarkers and personalised approaches are promising but still evolving for many subtypes.

Patients and families should ask for the exact lymphoma subtype, stage, pathology report details, and treatment goal. Those details are more useful than the word "lymphoma" alone when understanding what comes next.