Non-Hodgkin lymphoma

Signs and symptoms

The most typical initial sign is a painless swelling in a lymph node, often in the neck, armpit or groin. For example, people may notice an enlarged node in the neck or groin. Other common symptoms include unexplained weight loss, fever, night sweats, fatigue, and frequent infections as the abnormal cells can impair normal immune function. Individual presentations vary with the type and location of disease; some forms are slow-growing and produce few symptoms, while others progress rapidly.

Causes, classification and notable forms

Non-Hodgkin lymphomas arise from malignant transformation of B lymphocytes or T lymphocytes. Clinicians classify them by cell type, appearance under the microscope, and genetic or molecular features. Two widely recognized categories are indolent (slow-growing) and aggressive (fast-growing) lymphomas. Among the better known subtypes are follicular lymphoma and diffuse large B-cell lymphoma, each with different behavior and treatment approaches. Risk factors that have been associated with higher likelihood of developing the disease include certain infections, a weakened immune system, and some environmental or occupational exposures, although many cases have no identifiable cause.

Diagnosis and staging

A definitive diagnosis usually requires tissue examination. Physicians obtain a sample through a biopsy of an enlarged node or other involved tissue. Laboratory studies then determine the cell type and other features. Staging uses imaging and sometimes bone marrow sampling to establish the extent of spread within the lymphatic system and beyond. Staging and subtype are central to deciding on therapy and estimating expected course.

Treatment and prognosis

Treatment depends on the specific subtype, stage, and patient factors. Options may include watchful waiting for some slow-growing forms, localized radiation for limited disease, systemic chemotherapy, targeted immunotherapies that direct the immune system against cancer cells, and hematopoietic (stem cell) transplantation in selected cases. Newer targeted drugs and immunotherapies have expanded choices in recent years. Prognosis varies: some patients achieve long-term remission while others require ongoing therapy or have a more aggressive course.

Important distinctions and further information

Non-Hodgkin lymphoma is distinct from Hodgkin lymphoma, which is characterized by Reed-Sternberg cells and has different treatment patterns and outcomes. Because the topic spans many subtypes and evolving therapies, people with a new diagnosis are often referred to cancer centers or specialists for subtype-specific advice. For basic anatomical and clinical background see resources on the lymphatic system, the role of infection in immunity, and standard references on lymph nodes and their function. If you are researching symptoms or tests consult reliable medical sources or discuss concerns with a healthcare professional; common symptom descriptions and guidance are available in patient information pages such as those indexed at symptom guides and institutional materials linked through lymphocyte overviews. For practical steps on evaluation and care planning see clinical summaries and referral information at immune system resources and specialized oncology centers represented by treatment guides and patient support pages.