There are 2 types of lymphomas, Hodgkins disease and Non-Hodgkins Lymphoma. The difference between the two types are seen by microscope.

The main symptom is swelling of a lymph node. The enlarged node is usually painless and other signs and symptoms can come up such as: fatigue, unexplained fever and weight loss, rash, and night sweats.

The diagnosis is made by taking a biopsy or aspiration of the lymph node and studying it in a lab. X-Rays, MRI's and CT scans are other ways to diagnose lymphoma.

Treatment can be in the form of chemotherapy, radiation therapy, immunotherapy, and bone marrow transplants.

I have added links for more detailed information:

Lymphoma

Lymphoma Information Network - Adult Hodgkin's Disease

Lymphoma Information Network - Adult Non-Hodgkin's Diagnosis

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