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Marginal Zone Lymphoma: Causes, Symptoms, and Treatment

Medically reviewed by Achuta Uppu, MD, Internal Medicine. Last reviewed: October 23, 2026.

What kind of doctor treats Marginal Zone Lymphoma?

A hematologist-oncologist, a doctor who treats blood and lymph cancers, usually leads care for marginal zone lymphoma. Some people also see a radiation oncologist, a doctor who treats cancer with radiation. A direct primary care or concierge doctor can be a first stop for an evaluation and can refer you to a specialist when needed.

What is marginal zone lymphoma?

Marginal zone lymphoma (MZL) is a type of non-Hodgkin lymphoma. This is a disease in which cancer cells form in the lymph system. MZL begins in B lymphocytes in a part of lymph tissue called the marginal zone.

MZL is an indolent lymphoma. This means it tends to grow and spread slowly and has few signs and symptoms. There are five types:

• Nodal MZL forms in lymph nodes. It is rare.
• Gastric MALT lymphoma usually begins in the stomach.
• Extragastric MALT lymphoma begins outside the stomach, such as in the thyroid, lung, or skin.
• Splenic MZL begins in the spleen and may spread to the blood and bone marrow.
• Mediterranean abdominal lymphoma is a type of MALT lymphoma. It occurs in young adults in eastern Mediterranean countries.

Symptoms

Non-Hodgkin lymphoma, which includes MZL, can cause these signs and symptoms:

• Swollen 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.

When fever, drenching night sweats, and weight loss occur together, they are called B symptoms. These signs may also be caused by other conditions.

The most common sign of splenic MZL is a spleen that is larger than normal.

Causes and who gets it

Older age, being male, and having a weakened immune system can raise the risk of non-Hodgkin lymphoma. Not everyone with these risk factors will develop it.

People with gastric MALT lymphoma may also have Helicobacter gastritis. They may also have an autoimmune disease, such as Hashimoto thyroiditis.

How doctors diagnose it

Your doctor asks about your personal and family health history and does a physical exam. Tests may include:

• A complete blood count, which measures the number of red blood cells, white blood cells, and platelets.
• A CT scan, which makes detailed pictures of areas inside the body.
• A lymph node biopsy, which removes all or part of a lymph node. A pathologist then checks the tissue under a microscope for cancer cells.
• A bone marrow biopsy, which removes a sample of bone marrow and a small piece of bone to examine under a microscope.

Treatment

Treatment depends on the type of marginal zone lymphoma. Options include:

• Watchful waiting, which is closely monitoring your condition without treatment until signs or symptoms appear or change.
• Antibiotics, which treat infections caused by bacteria.
• Radiation therapy, which uses high-energy x-rays to kill cancer cells or keep them from growing.
• Chemotherapy, which uses drugs to stop cancer cells from growing.
• Monoclonal antibodies, which are immune system proteins made in a lab. They can attach to cancer cells.
• Surgery to remove the lymphoma in some cases.

For gastric MALT lymphoma, antibiotics to treat Helicobacter pylori infection are given first. Treating this infection may resolve most cases that are limited to the stomach. If the tumor does not respond, treatment is radiation, surgery, or a monoclonal antibody with or without chemotherapy.

For splenic MZL, first treatment is a monoclonal antibody with or without chemotherapy. If the tumor does not respond, a splenectomy may be done. This is surgery to remove the spleen.

Extragastric MALT lymphoma may come back many years after treatment.

When to see a doctor

Check with your doctor if you have swelling in the lymph nodes in the neck, underarm, groin, or stomach. Also check about fever, drenching night sweats, or weight loss for no known reason. These signs may be caused by lymphoma or by other conditions.

Call 911 or go to the emergency room if you have trouble breathing, chest pain lasting two minutes or more, fainting, a change in mental status, or bleeding that will not stop.

How a direct primary care or concierge doctor fits in

A direct primary care doctor charges a flat monthly fee instead of billing insurance, while a concierge doctor usually charges more and often works alongside insurance. Either can order first tests, help you keep track of symptoms, and coordinate your care with a cancer specialist.

Common questions

Is marginal zone lymphoma slow growing?

Yes, marginal zone lymphoma is an indolent lymphoma. This kind of lymphoma tends to grow and spread slowly and has few signs and symptoms.

Does marginal zone lymphoma always need treatment right away?

No. Doctors may use watchful waiting for people who do not have signs or symptoms. This means closely monitoring the condition without treatment until signs or symptoms appear or change.

Can an infection play a role in marginal zone lymphoma?

Yes, for some types. People with gastric MALT lymphoma may also have Helicobacter gastritis. This is stomach inflammation linked to Helicobacter bacteria.

Can antibiotics treat marginal zone lymphoma?

Yes, for some types. For gastric MALT lymphoma, antibiotics to treat Helicobacter pylori infection are given first.

Sources

1. National Cancer Institute - Non-Hodgkin Lymphoma Treatment (PDQ)
2. National Cancer Institute - Indolent B-Cell Non-Hodgkin Lymphoma Treatment (PDQ)

Medical Disclaimer

This content is for general educational and informational purposes only and is not medical advice. It is not a substitute for professional medical advice, diagnosis, or treatment, and reading it does not create a doctor-patient relationship. Always seek the advice of your physician or another qualified health provider with any questions about a medical condition, and never disregard or delay seeking professional advice because of something you read here. If you think you may have a medical emergency, call 911 (or your local emergency number) immediately.