Lymphoma is a cancer that begins in the lymphatic system—the body's disease-fighting network. This system includes your lymph nodes (glands), spleen, thymus gland, and bone marrow.
The Mechanism: Lymphocytes (a type of white blood cell) mutate and grow out of control. Because lymphatic tissue is found all over the body, lymphoma can start almost anywhere.
Hodgkin's vs. Non-Hodgkin's: What's the Difference?
If you or a loved one is diagnosed, the first thing doctors will determine is which of the two main categories the lymphoma falls into. The distinction is made by looking at the cancer cells under a microscope.
| Feature | Hodgkin's Lymphoma (HL) | Non-Hodgkin's Lymphoma (NHL) |
|---|---|---|
| The Defining Cell | Contains a specific, giant mutated cell called a Reed-Sternberg cell. | Does not contain Reed-Sternberg cells. |
| Prevalence | Less common. | Much more common (accounts for about 90% of lymphomas) and includes over 60 different subtypes. |
| Who Gets It? | Most often diagnosed in young adults (ages 20-34) and those over 55. | Risk generally increases with age; most common in people over 60. |
| Prognosis | Considered one of the most curable forms of cancer. | Varies widely depending on the subtype (some are slow-growing, others are aggressive), but many are highly treatable. |
Signs & Symptoms: The "B Symptoms"
The most common early sign of lymphoma is a painless swelling of lymph nodes in your neck, armpits, or groin. Because it doesn't hurt, it is easily ignored. Doctors also look for a specific cluster of systemic signs known as "B Symptoms," which indicate a more aggressive disease:
- Fever: Unexplained fevers that come and go over several days or weeks.
- Drenching Night Sweats: Waking up so soaked in sweat that you need to change your clothes or bedsheets.
- Unexplained Weight Loss: Losing 10% or more of your body weight over 6 months without trying.
Other symptoms may include persistent fatigue, severe itching all over the body, or shortness of breath.
Lymph nodes in the chest can sometimes swell massively before you notice any lumps on your neck or armpits. If you experience sudden, severe shortness of breath, chest pain, or swelling of your face and arms, go to the emergency room immediately. This can be a sign of a tumor pressing on your windpipe or major blood vessels.
Risk Factors
While the exact cause is a DNA mutation, several factors increase the likelihood of developing lymphoma:
- A Weakened Immune System: People with HIV/AIDS, or those taking immunosuppressant drugs after an organ transplant, are at a significantly higher risk.
- Certain Viral Infections: Having had the Epstein-Barr virus (which causes mononucleosis/mono) is linked to an increased risk of Hodgkin's lymphoma.
- Chemical Exposure: Heavy, prolonged exposure to certain toxic chemicals, like some pesticides and weed killers, has been linked to Non-Hodgkin's lymphoma.
Diagnosis & Advanced Treatments
A diagnosis is made through a Lymph Node Biopsy (removing all or part of a swollen node). Imaging tests like PET and CT scans are then used to map where the cancer has spread throughout the body.
Treatment Options
Because lymphoma is a cancer of the blood and lymph system, surgery is rarely a primary treatment. Instead, systemic treatments are used:
- Chemotherapy & Radiation: The most common first-line treatments to destroy the cancer cells.
- Targeted Therapy: Drugs that specifically seek out and attack vulnerabilities in lymphoma cells without damaging healthy cells.
- Immunotherapy & CAR T-cell Therapy: A revolutionary treatment where a patient's own immune cells (T-cells) are extracted, genetically engineered in a lab to recognize and attack the lymphoma, and then infused back into the body.
- Bone Marrow Transplant (Stem Cell Transplant): Used if the lymphoma returns after initial treatment. Diseased bone marrow is replaced with healthy stem cells to rebuild the immune system.
Reviewed & Sources: WHO, CDC, medical textbooks
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