What Is Lymphoma, Lymph Cancer? What Are Its Symptoms and Treatment?

Lymphoma is a cancer originating in immune system cells called lymphocytes and is a cancer of the lymphatic system. In simplest terms, lymphoma is cancer of the lymphatic system, commonly also called lymph cancer . It can occur at any age but is especially common in young adults. It is generally treatable, and appropriate treatment allows many patients to live for years after diagnosis. Its first sign is often painless swollen lymph nodes. This article provides scientifically accurate, current answers to questions such as “What is lymphoma, what causes it, what are its symptoms, what are its stages and how is it treated?”

What Are the Lymphatic System and Lymphatic Circulation?

To understand lymphoma, first we need to know the lymphatic system where it arises. Part of the immune system, it protects against infection and disease. It comprises various cells and organs, especially a white blood cell type called lymphocytes. There are two main lymphocyte types:

• B lymphocytes (B cells): B cells produce proteins called antibodies to defend against harmful foreign structures such as viruses and bacteria. They also act as “memory cells,” enabling rapid responses when the same threat returns.
• T lymphocytes (T cells): There are various subtypes. Some directly destroy virus-infected cells, bacteria and abnormal cells. Others regulate other immune cells to create a coordinated defense response.

Structure of the Lymphatic System: The lymphatic system consists of a vessel network and chains of lymph nodes throughout the body.

Its main components are:

• Lymph nodes (lymph glands): Small, bean-sized glands containing lymphocytes and other immune cells. They occur throughout the body, especially the neck, armpits and groin, forming an interconnected network through lymph vessels.
• Lymph vessels: Thin channels circulating lymph fluid, carrying fluid collected from tissues to lymph nodes and then back into blood circulation.
• Spleen: An organ in the upper left abdomen beneath the ribs. It produces immune cells, including lymphocytes, and filters old or damaged blood cells from circulation.
• Bone marrow: Soft tissue inside certain bones, where new blood cells, including lymphocytes, are produced. B and T lymphocytes are initially produced there; T cells then travel to the thymus to mature.
• Thymus gland: A small organ just behind the breastbone above the heart. Active in childhood and youth, it is important for T lymphocyte maturation.
• Tonsils and adenoids: Clusters of lymphatic tissue at the back of the throat, producing antibodies against microbes entering through breathing or swallowing.
• Peyer’s patches and other lymph tissues: Lymphatic tissue areas throughout the digestive tract, especially the intestines, generating immune responses against ingested pathogens.

What Is Lymphatic Circulation?

Fluid circulating within the lymphatic system is called lymph . Lymphatic circulation absorbs fluid between tissues into lymph vessels, transports it to nodes for filtering and finally returns it to blood. Excess tissue fluid is collected, while immune cells circulate throughout the body to defend against infection. Nodes filter lymph, trapping foreign particles such as bacteria and viruses and abnormal cells. It is a fundamental defense mechanism, and disruption can reduce infection resistance.

Schematic view of the lymphatic system: lymph nodes (green dots) throughout the body and the vessels connecting them. Lymphatic circulation carries tissue fluid to these nodes for filtering.

- What Are Lymph Nodes? Where Are They and Why Do They Swell? In our article with this title, you can find more detail about Lymph Nodes .

Types of Lymphoma

Lymphoma has two main types: Hodgkin lymphoma and non-Hodgkin (Non-Hodgkin) lymphoma. Both contain numerous subtypes. More than 60 Non-Hodgkin subtypes have been described, while Hodgkin has a few. They are also classified by their lymphocyte of origin as B-cell or T-cell . B-cell lymphoma accounts for most Non-Hodgkin cases; T-cell lymphomas are rarer.

Hodgkin Lymphoma

Hodgkin lymphoma (also pronounced Hoçkin) represents approximately %10-20 of cases. Its main distinguishing feature is finding abnormal large B lymphocytes called Reed-Sternberg cells on biopsy. These giant cells’ characteristic microscopic appearance determines the diagnosis. Hodgkin lymphoma can occur at any age but is most common in young adults in their 20s and people over their 50s (two peaks). It is slightly more common in men. It generally starts in a more limited area and tends to spread sequentially to nearby lymph nodes. Modern treatments offer high cure rates, and most patients can recover completely with correct treatment.

Non-Hodgkin Lymphoma

Non-Hodgkin lymphoma (NHL) includes all lymphomas other than Hodgkin and approximately %80-90 of cases. This group is diverse, and subtype behavior can differ. Most Non-Hodgkin lymphomas are B-cell lymphomas. The cancerous cells therefore originate in B lymphocytes. A smaller proportion consists of T-cell lymphoma subtypes originating in T lymphocytes. Rare lymphomas also arise from NK cells. Non-Hodgkin subtypes are generally divided by biological behavior into two groups:

• Slow-growing (indolent) lymphomas: Considered low-grade, these usually grow slowly, with mild symptoms possibly unnoticed for years. Examples include Follicular lymphoma, Small lymphocytic lymphoma (SLL) and MALT lymphoma.
• Aggressive (fast-growing) lymphomas: High-grade lymphomas with rapid growth. They can spread quickly, cause serious symptoms and threaten life rapidly without treatment. Diffuse Large B-Cell Lymphoma (DLBCL), the most common aggressive NHL subtype, grows quickly but is often treatable with intensive chemotherapy. Burkitt lymphoma is rare and highly aggressive.

Many Non-Hodgkin subtypes are defined by cell type and molecular characteristics. Common ones include Diffuse Large B-Cell Lymphoma (~%30 of cases) and Follicular Lymphoma (~%20). Mantle cell, Marginal zone and Small lymphocytic lymphoma are less common. Each subtype may have a different course and treatment response, making subtype identification essential for planning.

What Is B-Cell Lymphoma?

B-cell lymphoma is the general term for lymphomas caused by uncontrolled B lymphocyte multiplication. Most Non-Hodgkin cases are B-cell, so the term is common. Examples include Diffuse Large B-Cell and Follicular Lymphoma. These generally respond well to anti-CD20 and similar B-cell-targeted drugs (such as rituximab). T-cell lymphomas are rarer and may differ in response and disease course.

What Causes Lymphoma?

As with most cancers, its exact cause is not fully understood. What causes lymphoma? has no clear answer, but research has identified some risk factors . People with them may be more likely to develop lymphoma. Hodgkin and Non-Hodgkin have some differences in risk factors:

Non-Hodgkin Lymphoma Risk Factors

• Older age: Risk increases with age. Most cases occur at 60 and older. (United States data give a median diagnosis age of ~67.)
• Sex: Some subtypes are more common in women and others in men, but overall Non-Hodgkin incidence is slightly higher in men.
• Geography: Non-Hodgkin lymphoma is more frequently reported in developed countries, possibly reflecting environmental or lifestyle differences.
• Harmful chemicals and radiation: Exposure to agricultural chemicals such as some pesticides or past high-dose radiation (such as nuclear radiation) may increase risk.
• Immune deficiency: Immunosuppression raises lymphoma risk. People taking immunosuppressants after organ transplantation or living with HIV/AIDS, for example, have increased Non-Hodgkin risk.
• Autoimmune diseases: In autoimmune diseases such as rheumatoid arthritis and SLE (Lupus), immune abnormalities may somewhat increase risk.
• Chronic infections: Long-standing viral and bacterial infections can favor lymphoma development. The stomach bacterium Helicobacter pylori , for example, can cause MALT lymphoma . In addition, Epstein-Barr virus (EBV) infection (such as infectious mononucleosis in young people) has been associated with some lymphomas.

Hodgkin Lymphoma Risk Factors

• Epstein-Barr virus infection: People who have had EBV-related infectious mononucleosis (also called “kissing disease”) have slightly higher Hodgkin risk than the general population.
• Age: Hodgkin lymphoma has two age peaks: young adulthood (the 20s) and older age (over 55), with increased risk in both.
• Sex: Hodgkin lymphoma is slightly more common in men.
• Family history: Risk rises modestly with affected first-degree relatives, especially siblings. A marked increase occurs in identical twins whose sibling had Hodgkin lymphoma.
• Geography and socioeconomic status: Hodgkin disease is more common in the United States, Canada and Northern Europe and rarer in Asia and Africa. Rates are also reportedly somewhat higher in socioeconomically advantaged groups.
• Immune deficiency: Severely weakened immunity, such as HIV/AIDS, increases Hodgkin lymphoma risk.

Many people with these risk factors never develop lymphoma, while some diagnosed patients have none. Having no risk factors does not guarantee freedom from lymphoma, and having them does not mean it will definitely develop. They are conditions that may predispose to it.

What Are Lymphoma Symptoms?

Symptoms can resemble common infections. A cold, for example, can also cause swollen nodes, fever and fatigue. However, lymph cancer symptoms generally last longer and do not resolve spontaneously. Duration and accompanying findings therefore matter. The most common symptom is painless swelling of lymph nodes. This may appear as hard, enlarged masses in the neck, armpits or groin. Some patients have no obvious complaint besides swelling. As disease progresses or spreads, various systemic symptoms begin.

Lymphoma symptoms generally include:

• Swollen lymph nodes: Painless palpable swellings, especially in the neck, armpits or groin, are most common. Unlike infection-related swelling, these persist and may grow progressively.
• Chronic tiredness and fatigue: A person may feel constantly exhausted and tire faster than normal.
• Fever and night sweats: Especially unexplained fever episodes above 38°C and drenching night sweats soaking the bed (lymphoma-related B symptoms).
• Loss of appetite and weight: Unintentional weight loss over a short period (over 6 months, more than %10 of body weight) may occur. Patients often report poor appetite.
• Persistent cough or shortness of breath: Enlarged chest lymph nodes can compress lungs and airways, causing persistent dry cough and breathing difficulty.
• Abdominal pain or swelling: Enlarged abdominal nodes or spleen can cause swelling, fullness and pain. Some patients experience further appetite loss because of this (early satiety).
• Swollen arms and legs: Blocked lymphatic circulation can cause edema (swelling) in the legs, ankles or arm.
• Itchy skin: Unexplained, persistent itching anywhere on the body may be a lymphoma symptom. Some patients have widespread skin itching.
• Frequent infections: Because lymphoma weakens immunity, infections may occur more often than normal or last longer.
• Other symptoms: Less commonly, headache, numbness or skin rashes may occur. They are not specific lymphoma signs and are generally evaluated alongside other conditions.

Important: If you have palpable swollen nodes in the neck, armpits or groin that do not improve within 2-3 weeks, see a doctor. Infection-related swelling generally returns to normal quickly, but lymphoma swelling does not resolve spontaneously and may grow.

Hodgkin Lymphoma Symptoms

These are generally similar to those listed above. Most patients have painless swollen neck nodes, fever, night sweats and weight loss. However, some symptoms are more likely than in other types:

• Severe itching: Many Hodgkin patients have widespread severe itching. It may be an early sign, and Hodgkin can be considered when no other cause explains it.
• Lymph node pain after alcohol: Although rare, enlarged nodes may become painful after alcohol, a symptom specific to Hodgkin. A patient may notice aching or pain in a swollen neck node soon after drinking. It is uncommon but highly specific.

Patients diagnosed with Hodgkin lymphoma may have some or all of these symptoms. Particularly fever, sweating and weight loss together form B symptoms , prominent in some Hodgkin patients and important in staging (expressed as the “B” category in staging, see below).

Does Lymphoma Cause Itching?

Unexplained skin itching is common in lymphoma. Particularly in Hodgkin, intense and widespread itching is reported more often than in other lymphoma types. It may be due to skin irritation from substances released by lymphoma. Non-Hodgkin can also cause itching, though sometimes less prominently. Persistent itching unresponsive to treatment, accompanied by swollen nodes or night sweats and weight loss, warrants medical consultation for possible underlying lymphoma.

How Is Lymphoma Diagnosed?

Early diagnosis is critical for treatment success. However, no routine screening test is used for healthy people (a special check-up screening). Patients generally seek medical care because of symptoms, and assessment establishes the diagnosis. To diagnose lymphoma, the physician’s steps and tests can be summarized as follows:

• Medical history and physical examination: The doctor listens closely to complaints and reviews past health, then examines areas that may contain enlarged nodes. Neck, above the collarbones, armpits and groin are palpated for abnormal swelling. The abdomen is examined for enlarged liver or spleen.
• Biopsy: The most important definitive test is biopsy. All or part of a swollen node is surgically removed and examined microscopically in pathology. It identifies lymphoma cells, whether Hodgkin or Non-Hodgkin, and the subtype. Reed-Sternberg cells establish Hodgkin; special stains also determine B- or T-cell origin.
• Blood tests: Complete blood count (CBC), liver and kidney function tests and LDH support lymphoma findings and assess general health. Elevated LDH and reduced counts such as lymphocytes, red cells or platelets may occur.
• Imaging methods: After biopsy diagnosis, imaging determines disease spread (stage). Computed tomography (CT) and Positron Emission Tomography (PET scan) are most common. PET-CT can detect active lymphoma sites in many body regions in one examination. MRI can also be used when necessary.
• Bone marrow biopsy: To see whether lymphoma has spread to marrow, especially in advanced disease or some aggressive types, a biopsy may be taken from the hip bone under local anesthesia.
• Cerebrospinal fluid (CSF) examination: Rarely, suspected central nervous system spread warrants lumbar puncture to collect and examine spinal fluid. This may also be performed preventively in some aggressive B-cell lymphomas.

These examinations and tests establish diagnosis, type and extent. The doctor then determines lymphoma stage and creates a treatment plan.

What Are Lymphoma Stages?

After diagnosis, the extent of cancer spread in the body is determined through staging is performed. Four main stages have been defined for lymphoma. Each stage expresses how extensively the disease has spread:

1. Stage I: The tumor is in one lymph node region or one lymphatic organ (such as the spleen alone), limited to one body area.
2. Stage II: Cancer involves multiple node regions on only one side of the diaphragm, the muscle layer separating chest and abdomen. It is in two or more regions but remains within the upper or lower half of the body.
3. Stage III: Lymphoma involves nodes on both sides of the diaphragm, for example both chest and abdomen. It may affect nodes above and below the diaphragm or spread to organs adjacent to lymphatic organs.
4. Stage IV: Disease extends beyond the lymphatic system to distant organs such as marrow or liver. This is the most advanced stage, and lymphoma is systemic.

Alongside the Roman numeral stages, letters A or B are added. Stage B indicates particular systemic symptoms: in the last 6 months, unexplained loss of more than %10 of body weight, unexplained fever above 38°C and drenching night sweats. Without these three, it is called stage A . “Stage IIIB lymphoma,” for example, means spread on both sides of the diaphragm with B symptoms (fever, sweating, weight loss). If no letter is used, A is assumed.

Stage is important for treatment planning and prognosis. Generally, low-stage (I-II) disease has higher treatment chances and success. Advanced stages may require more intensive treatment, but high success rates remain possible.

How Is Lymphoma Treated?

Lymphoma treatment (lymph cancer treatment) is planned by type (Hodgkin or Non-Hodgkin), subtype, stage and general health. The best approach may differ for each patient. Generally, the main methods used in lymphoma treatment are:

• Chemotherapy (drug treatment): Systemic anticancer drugs kill cancer cells or stop growth. Chemotherapy protocols often form the basis of lymphoma treatment.
• Radiotherapy (radiation treatment): High-energy rays locally destroy cancerous lymphatic tissue. It may complement chemotherapy, especially in some early Hodgkin cases or lymphomas limited to one region.
• Targeted treatments: Drugs attack specific molecular targets on or inside lymphoma cells. Monoclonal antibodies (such as Rituximab and Brentuximab vedotin) belong here and have produced revolutionary success, especially in B-cell lymphomas.
• Immunotherapy: Treatments strengthen immunity or train it to target cancer cells. Immune control proteins (checkpoint inhibitors) or reprogramming T cells to fight cancer (CAR-T cell therapy) are included.
• Stem cell transplantation: After high-dose chemotherapy, healthy blood stem cells from the patient (autologous) or a suitable donor (allogeneic) restore damaged marrow. It may be used particularly for recurrent or advanced disease.
• Supportive treatments: These reduce treatment side effects and improve quality of life, including infection prophylaxis, growth factors, blood transfusions and symptomatic treatments.

Plans may combine one or several methods. For Diffuse Large B-Cell Lymphoma, a common aggressive type, the standard is 6 cycles of R-CHOP , a regimen combining rituximab + cyclophosphamide, doxorubicin, vincristine and prednisone. It controls disease in many patients. New drugs have further improved success; for example, targeted polatuzumab vedotin combined with R-CHP improved progression-free survival in a particular risk group.

Hodgkin treatment also generally uses combined chemotherapy. One common regimen is ABVD (Adriamycin, Bleomycin, Vinblastine, Dacarbazine). Most early-stage patients can recover completely with chemotherapy alone or chemotherapy + low-dose radiotherapy. Advanced Hodgkin needs more intensive treatment, and new targeted agents have entered use. In particular, the CD30-targeted monoclonal antibody Brentuximab vedotin (Adcetris) has been added to initial treatment in some advanced Hodgkin patients, improving outcomes. In recurrent Hodgkin, immunotherapy drugs such as pembrolizumab , a PD-1 inhibitor, have also entered use.

Non-Hodgkin treatment varies further by subtype. Aggressive NHL such as DLBCL requires urgent intensive chemotherapy, while some indolent cases allow “watch and wait” without immediate treatment. Slow-growing follicular lymphoma is generally not completely curable but can be controlled for years. Treatment timing and selection require careful planning based on clinical condition. Over the last 20 years, targeted treatments such as rituximab and new biological agents have markedly prolonged survival in indolent lymphomas too.

In lymphoma treatment, stem cell transplantation is important. Especially in resistant or recurrent disease, high-dose chemotherapy followed by autologous transplantation achieves long-term control in many patients. Depending on disease status, it can also be considered after initial treatment (such as consolidation in high-risk young patients). Allogeneic donor transplantation is riskier but can be curative in suitable patients.

One of the newest approaches today is CAR-T cell therapy , an advanced immunotherapy. The patient’s own T lymphocytes are genetically engineered in the laboratory and returned; these “programmed” cells target lymphoma cells. CAR-T has succeeded particularly in certain B-cell Non-Hodgkin subtypes resistant to other treatment (such as DLBCL, primary mediastinal B-cell lymphoma and some leukemia/lymphoma forms). Several CAR-T therapies have FDA approval and can be administered in certain centers in our country. It is considered a breakthrough, expected to have broader future use.

A conceptual medical illustration showing uncontrolled growth of lymphoma (lymph cancer) cells within a lymph node. Abnormal cancerous lymphocytes multiply and cause marked node enlargement.

In summary, lymphoma treatment is an area in which successful results can be achieved. More than %80 of Hodgkin patients and a large proportion of Non-Hodgkin patients (varying by subtype and stage) survive for long periods with treatment. Rates are higher with early diagnosis. New targeted drugs and immunotherapies are developed annually alongside chemotherapy and radiotherapy protocols, enabling important progress even in previously resistant cases. Patients need regular monitoring and side-effect management during treatment. After completion, periodic checks allow early recurrence detection and another chance to intervene.

Conclusion

Lymphoma is cancer arising from uncontrolled growth of lymphocytes, an important part of immunity. Starting in nodes, it can spread through the lymphatic system. Fortunately, among cancers, lymphoma has high treatment potential . With early diagnosis and correct protocols, many patients recover completely or live healthily for years. If symptoms suggest lymphoma—persistent node swelling, night sweats or unexplained weight loss—seek healthcare without delay. New medical advances continue to increase treatment success daily and offer encouraging outcomes.

Wishing you good health.