Adult non-Hodgkin lymphoma is a disease in which malignant (cancer) cells form in the lymph system.

The lymph system is part of the immune system and is made up of the following:

• Lymph: Colorless, watery fluid that travels through the lymph system and carries white blood cells called lymphocytes. Lymphocytes protect the body against infections and the growth of tumors.
• Lymph vessels: A network of thin tubes that collect lymph from different parts of the body and return it to the bloodstream.
• Lymph nodes: Small, bean-shaped structures that filter lymph and store white blood cells that help fight infection and disease. Lymph nodes are located along the network of lymph vessels found throughout the body. Clusters of lymph nodes are found in the underarm, pelvis, neck, abdomen, and groin.
• Spleen: An organ that makes lymphocytes, filters the blood, stores blood cells, and destroys old blood cells. It is on the left side of the abdomen near the stomach.
• Thymus: An organ in which lymphocytes grow and multiply. The thymus is in the chest behind the breastbone.
• Tonsils: Two small masses of lymph tissue at the back of the throat. The tonsils make lymphocytes.
• Bone marrow: The soft, spongy tissue in the center of large bones. Bone marrow makes white blood cells, red blood cells, and platelets.

Anatomy of the lymph system, showing the lymph vessels and lymph organs including lymph nodes, tonsils, thymus, spleen, and bone marrow. Lymph (clear fluid) and lymphocytes travel through the lymph vessels and into the lymph nodes where the lymphocytes destroy harmful substances. The lymph enters the blood through a large vein near the heart.

Because lymph tissue is found throughout the body, adult non-Hodgkin lymphoma can begin in almost any part of the body. Cancer can spread to the liver and many other organs and tissues.

Non-Hodgkin lymphoma in pregnant women is the same as the disease in nonpregnant women of childbearing age. However, treatment is different for pregnant women. This summary includes information on the treatment of non-Hodgkin lymphoma during pregnancy.

Non-Hodgkin lymphoma can occur in both adults and children. Treatment for children, however, is different than treatment for adults. (See the PDQ summary on Childhood Non-Hodgkin Lymphoma Treatment for more information.)

There are many different types of lymphoma.

Lymphomas are divided into two general types: Hodgkin lymphoma and non-Hodgkin lymphoma. This summary is about the treatment of adult non-Hodgkin lymphoma. For information about other types of lymphoma, see the following PDQ summaries:

• Adult Acute Lymphoblastic Leukemia Treatment
• Adult Hodgkin Lymphoma Treatment
• AIDS-Related Lymphoma Treatment
• Chronic Lymphocytic Leukemia Treatment
• Hairy Cell Leukemia Treatment
• Multiple Myeloma and Other Plasma Cell Neoplasms Treatment
• Mycosis Fungoides and the Sézary Syndrome Treatment
• Primary CNS Lymphoma Treatment

Age, gender, and a weakened immune system can affect the risk of developing adult non-Hodgkin lymphoma.

Anything that increases your risk of getting a disease is called a risk factor. Having a risk factor does not mean that you will get cancer; not having risk factors doesn’t mean that you will not get cancer. People who think they may be at risk should discuss this with their doctor. Risk factors for adult non-Hodgkin lymphoma include the following:

• Being older, male, or white.
• Having one of the following medical conditions:
  • An inherited immune disorder (for example, hypogammaglobulinemia or Wiskott-Aldrich syndrome).
  • An autoimmune disease (for example, rheumatoid arthritis, psoriasis, or Sjögren syndrome ).
  • HIV / AIDS.
  • Human T-lymphotrophic virus type I or Epstein-Barr virus.
  • A history of Helicobacter pylori infection.
• Taking immunosuppressant drugs after an organ transplant.
• Being exposed to certain pesticides.
• A diet high in meats and fat.
• Past treatment for Hodgkin lymphoma.

Possible signs of adult non-Hodgkin lymphoma include fever, sweating, fatigue, and weight loss.

These and other symptoms may be caused by adult non-Hodgkin lymphoma. Other conditions may cause the same symptoms. A doctor should be consulted if any of the following problems occur:

• Painless swelling in the lymph nodes in the neck, underarm, groin, or stomach.
• Fever for no known reason.
• Drenching night sweats.
• Feeling very tired.
• Weight loss for no known reason.
• Skin rash or itchy skin.
• Pain in the chest, abdomen, or bones for no known reason.

Tests that examine the body and lymph system are used to help detect (find) and diagnose adult non-Hodgkin lymphoma.

The following tests and procedures may be used:

• Physical exam and history: An exam of the body to check general signs of health, including checking for signs of disease, such as lumps or anything else that seems unusual. A history of the patient’s health habits and past illnesses and treatments will also be taken.
• Complete blood count (CBC): A procedure in which a sample of blood is drawn and checked for the following:
  • The number of red blood cells, white blood cells, and platelets.
  • The amount of hemoglobin (the protein that carries oxygen ) in the red blood cells.
  • The portion of the sample made up of red blood cells.
  Complete blood count (CBC). Blood is collected by inserting a needle into a vein and allowing the blood to flow into a tube. The blood sample is sent to the laboratory and the red blood cells, white blood cells, and platelets are counted. The CBC is used to test for, diagnose, and monitor many different conditions.
• Blood chemistry studies: A procedure in which a blood sample is checked to measure the amounts of certain substances released into the blood by organs and tissues in the body. An unusual (higher or lower than normal) amount of a substance can be a sign of disease in the organ or tissue that makes it.
• Lymph node biopsy: The removal of all or part of a lymph node. A pathologist views the tissue under a microscope to look for cancer cells. One of the following types of biopsies may be done:
  • Excisional biopsy: The removal of an entire lymph node.
  • Incisional biopsy: The removal of part of a lymph node.
  • Core biopsy: The removal of part of a lymph node using a wide needle.
• Bone marrow aspiration and biopsy: The removal of bone marrow, blood, and a small piece of bone by inserting a needle into the hipbone or breastbone. A pathologist views the bone marrow, blood, and bone under a microscope to look for signs of cancer. Bone marrow aspiration and biopsy. After a small area of skin is numbed, a Jamshidi needle (a long, hollow needle) is inserted into the patient’s hip bone. Samples of blood, bone, and bone marrow are removed for examination under a microscope.
• Liver function tests: A procedure in which a blood sample is checked to measure the amounts of certain substances released into the blood by the liver. For non-Hodgkin lymphoma, the blood is checked for an enzyme called lactate dehydrogenase (LDH). LDH levels help determine prognosis (chance of recovery).

Certain factors affect prognosis (chance of recovery) and treatment options.

The prognosis (chance of recovery) and treatment options depend on the following:

• The stage of the cancer.
• The type of non-Hodgkin lymphoma.
• The patient’s age and general health.
• Whether the lymphoma has just been diagnosed or has recurred (come back).

Prognosis also depends on the level of LDH in the blood.

For non-Hodgkin lymphoma during pregnancy, the treatment options also depend on:

• The wishes of the patient
• Which trimester of pregnancy the patient is in.

Some types of non-Hodgkin lymphoma spread more quickly than others do. Most non-Hodgkin lymphomas that occur during pregnancy are aggressive. Delaying treatment of aggressive lymphoma until after the baby is born may lessen the mother’s chance of survival. Immediate treatment is often recommended, even during pregnancy.