Understanding this cancer and the lymphatic system
Definition
Lymphoma is a cancer that starts in the lymphatic system, which includes lymph nodes, lymph vessels, the spleen, and other immune-related tissues. It begins in lymphocytes (white blood cells that help fight infection).
This cancer can show up in lymph nodes (often felt as a lump), but it can also involve the blood, bone marrow, spleen, or other organs.
Two broad categories are commonly discussed:
- Hodgkin lymphoma, which has distinctive cells seen on pathology and is often highly treatable
- Non-Hodgkin lymphoma, a larger group made up of many subtypes (often described by B-cell or T-cell origin)
Because lymphoma subtypes behave differently, the exact classification is an important part of care planning.
What can increase risk
Causes
In many people, the exact cause isn’t known. Most cancers begin when cells develop DNA changes that disrupt normal growth and survival signals. When these changes occur in lymphocytes, the abnormal cells can multiply, live longer than they should, and accumulate over time, which can lead to lymphoma.
Risk factors that may raise risk
- Family history in a close blood relative
- A weakened immune system (including after an organ transplant)
- Autoimmune conditions (for example, rheumatoid arthritis or lupus)
- Certain infections linked with higher risk in some populations (such as HIV or Epstein-Barr virus)
Having risk factors does not mean a person will develop this disease—only that risk may be higher than average.
Signs and symptoms to watch for
Symptoms
Symptoms depend on the lymphoma subtype and where the cancer is affecting the body. Early disease may cause few symptoms.
Common symptoms
- Swollen lymph nodes that feel like a lump under the skin (often in the neck, armpit, or groin)
- Fever
- Drenching night sweats
- Ongoing fatigue
- Unintended weight loss
- Itchy skin
Symptoms that may relate to location
- Chest discomfort or cough (if nodes in the chest are involved)
- Abdominal fullness or pain
- Bone pain in some cases
When to seek urgent care
Get urgent help for severe shortness of breath, confusion, new weakness on one side, severe headaches with neurologic changes, uncontrolled vomiting/dehydration, or rapidly worsening symptoms.
How clinicians confirm the diagnosis
Diagnosis
Diagnosis for lymphoma usually combines an exam with tests that identify the subtype and determine how widespread it is.
Typical steps may include:
- History and physical exam, including lymph node assessment
- Blood tests to check blood counts and organ function
- Imaging such as CT and/or PET/CT to look for involved areas
- Biopsy (often the key step) to confirm lymphoma and define the exact subtype
- Bone marrow testing in selected situations
- Additional studies when specific organs may be involved (for example, evaluation for central nervous system involvement)
Staging describes where disease is present and helps guide treatment choices and follow-up.
Medicines used in care
Medications
Medication plans vary widely by subtype and stage. A licensed oncology team chooses medicines based on disease features and a person’s overall health.
Common medication categories used in care include:
- Chemotherapy
- Immunotherapy (including antibody-based options)
- Targeted therapy
- Steroids as part of combination regimens in some cases
- Supportive medications (for nausea, infection prevention, blood counts, pain, and other needs)
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Procedures, therapies, and follow-up
Treatments
Treatment for lymphoma depends on the subtype, stage, symptoms, and how fast the cancer is growing. Some slow-growing types can be monitored closely before starting therapy, while faster-growing types usually need treatment sooner.
Options that may be considered include:
- Active monitoring (“watch and wait”) for selected slow-growing cases without symptoms or organ risk
- Combination drug therapy tailored to subtype
- Radiation therapy for localized disease or symptom relief in specific situations
- Cell-based therapies (such as CAR-T) for selected indications
- Stem cell transplant approaches in certain pathways
- Clinical trials for access to emerging options
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Frequently asked questions people have
FAQs
How do I know if a swollen lymph node could be serious?
Many swollen nodes come from infections and improve over time. A node that keeps growing, lasts several weeks, feels firm, or comes with fever, night sweats, or weight loss is worth medical evaluation.
What is the difference between Hodgkin lymphoma and non-Hodgkin lymphoma?
They are different categories with different cell features, common subtypes, and typical treatment strategies. Outcomes depend on the exact subtype and stage.
What tests confirm lymphoma?
A biopsy is usually the most important test because it identifies the subtype. Imaging and blood tests help stage the disease and guide treatment planning.
Can it be cured?
Some types are often curable, especially when found early and treated appropriately. Other types can be managed as long-term conditions. Prognosis depends on subtype, stage, and response to treatment.
When should I see a doctor right away?
Seek urgent care for severe shortness of breath, confusion, severe headache with neurologic symptoms, uncontrolled bleeding, or rapidly worsening weakness.