Lymphoma is a cancer that starts in the lymph system
Lymphoma is a type of cancer that begins in lymphocytes, which are white blood cells that fight infection. These cells live in your lymph nodes (small bean-shaped structures throughout your body), your spleen, bone marrow, and other parts of your lymph system. When lymphoma develops, lymphocytes start to grow out of control and crowd out healthy cells.
There are two main categories: Hodgkin lymphoma and non-Hodgkin lymphoma. Hodgkin lymphoma follows a more predictable pattern as it spreads, while non-Hodgkin lymphoma can develop in many different ways and is more common overall. Both are serious, but the type matters because it changes how doctors treat the disease and what to expect.
Lymphoma can develop at any age, though some types are more common in children and others in older adults. It is not contagious and is not caused by anything you did or did not do.
Key Takeaways
- Lymphoma starts when lymphocytes (infection-fighting white blood cells) grow out of control in the lymph system.
- The two main types are Hodgkin lymphoma and non-Hodgkin lymphoma, and the type determines treatment options and outlook.
- Common early signs include swollen lymph nodes, unexplained fever, night sweats, and fatigue that does not go away with rest.
- Doctors use blood tests, imaging scans, and a biopsy (a small tissue sample) to confirm lymphoma and determine its stage.
- Treatment depends on the type, stage, and your overall health, and may include chemotherapy, radiation, immunotherapy, or a combination.
Early signs that may point to lymphoma
The most common early sign is swollen lymph nodes — lumps in your neck, armpits, or groin that you can feel under the skin. These nodes may be tender or painless. Swollen lymph nodes happen for many reasons (like a cold or infection), so this alone does not mean you have lymphoma, but it is worth mentioning to your doctor if they do not shrink within a few weeks.
Other signs include fever with no clear cause, night sweats that soak your clothes or sheets, unexplained weight loss, and tiredness that does not improve with rest. Some people have itching skin or pain in the lymph nodes after drinking alcohol, though this is less common. These symptoms can come from many conditions, but if they last more than two weeks, your doctor should investigate.
Many people have no symptoms at all and discover lymphoma by chance during imaging or blood work done for another reason. This is one reason why it is important to mention any persistent swelling or unusual symptoms to your doctor rather than assuming they will go away on their own.
How doctors test for and diagnose lymphoma
If your doctor suspects lymphoma, they will start with a physical exam and blood tests. The blood work checks your white blood cell count and other markers, but blood tests alone cannot confirm lymphoma — they can only raise suspicion.
The next step is usually imaging: a CT scan or PET scan to see if lymph nodes are enlarged and where they are located. These scans show the size and position of nodes throughout your body.
The only way to confirm lymphoma is a biopsy — your doctor removes a small piece of tissue (usually from a swollen lymph node) and sends it to a lab. A pathologist looks at the cells under a microscope to see if they are cancerous and what type of lymphoma it is. This takes a few days to a week. Once lymphoma is confirmed, more tests determine the stage — how far the cancer has spread — which guides treatment decisions.
The difference between Hodgkin and non-Hodgkin lymphoma
Hodgkin lymphoma is defined by the presence of specific cells called Reed-Sternberg cells, which doctors see under the microscope during the biopsy. It tends to spread in an orderly way from one lymph node group to the next, which makes it somewhat easier to predict and treat. Hodgkin lymphoma is less common and accounts for about 10 percent of all lymphomas.
Non-Hodgkin lymphoma is a larger group of cancers that do not have those specific cells. It can start anywhere in the lymph system and spread randomly, making it harder to predict. Non-Hodgkin lymphoma is more common and has many subtypes, each with different behavior and treatment needs. Your doctor will identify the specific subtype during the biopsy because it matters for your treatment plan.
Both types can be serious, but the type you have changes your prognosis (what doctors expect to happen) and the treatments your doctor will recommend. This is why the biopsy result is so important — it tells your doctor exactly what they are treating.
Stages of lymphoma and what they mean
Lymphoma is staged from I to IV based on how far it has spread. Stage I means cancer is in one lymph node group or one organ. Stage II means it is in two or more node groups on the same side of the diaphragm (the muscle that separates your chest from your belly). Stage III means nodes are affected on both sides of the diaphragm. Stage IV means the cancer has spread to organs outside the lymph system, such as the liver, lungs, or bone marrow.
Doctors also note whether you have B symptoms — fever, night sweats, or weight loss — because these affect treatment and outlook. A stage might be written as "Stage IIB" to show both the location and the presence of B symptoms.
The stage helps your doctor decide how aggressive treatment needs to be. Early-stage lymphoma may need less intensive treatment, while advanced stages usually require stronger chemotherapy or combination therapy. Staging is not a prediction of survival — many people with advanced-stage lymphoma respond very well to treatment.
Treatment options for lymphoma
Treatment depends on the type of lymphoma, the stage, your age, and your overall health. Some people with early-stage, slow-growing lymphoma may not need treatment right away — your doctor may recommend "watch and wait," meaning regular monitoring without starting therapy. Others need treatment to start soon after diagnosis.
Chemotherapy uses drugs to kill cancer cells and is often the first treatment. It is usually given in cycles over several months. Radiation therapy focuses high-energy beams on affected lymph nodes and is sometimes used alone or combined with chemotherapy. Immunotherapy drugs help your immune system recognize and attack lymphoma cells and are increasingly used, especially for certain types of non-Hodgkin lymphoma.
Many people receive a combination of these treatments. Your doctor will explain which approach they recommend, what to expect during treatment, and what side effects are common. Treatment plans are tailored to you, so what works for one person may differ from what another person receives.
What happens after treatment ends
After treatment, you will have follow-up visits with your oncologist (cancer doctor) to check for signs that lymphoma has returned. These visits include physical exams and sometimes imaging or blood tests. At first, visits may be every few weeks or months, then spread out over time if you remain in remission (cancer-free).
Some people go into complete remission and never have lymphoma return. Others may have it come back months or years later, which is why long-term follow-up matters. Your doctor will tell you what symptoms to watch for and when to call if something feels wrong.
Many people treated for lymphoma go on to live full, active lives. Advances in treatment over the past two decades have improved outcomes significantly, especially for Hodgkin lymphoma and some types of non-Hodgkin lymphoma. Your specific outlook depends on your type and stage, which your doctor can discuss with you in detail.
Frequently Asked Questions
Can you get lymphoma from someone else?
No. Lymphoma is not contagious and cannot spread from person to person through contact, blood, or any other means. It develops when your own cells begin to grow abnormally, not because of an infection you caught from someone else.
Is lymphoma always fatal?
No. Many people with lymphoma are treated successfully and go into remission. Survival rates have improved significantly over the past 20 years. Outcome depends on the type, stage, age, and overall health, so your doctor can give you a more specific picture based on your situation.
What causes lymphoma?
The exact cause is usually unknown. Some risk factors include a weakened immune system, certain infections, and family history, but most people with these risk factors never develop lymphoma. Lymphoma is not caused by stress, diet, or anything you did or did not do.
How long does lymphoma treatment take?
Treatment length varies widely depending on the type and stage. Chemotherapy cycles typically last several months, sometimes up to a year. Some people need only a few months of treatment, while others may need longer. Your doctor will outline the expected timeline for your specific plan.
Can lymphoma come back after remission?
Some types of lymphoma can return after treatment, while others rarely do. This is why follow-up appointments matter — they catch any return early. If lymphoma does return, it can often be treated again, sometimes with different drugs or approaches than the first time.