Lymphoma is a generic term used for a variety of tumour diseases originating from lymphocytes. The symptoms of lymphoma often begin with a painless swelling in a lymph node and is regularly overlooked and often misdiagnosed as a flu or fatigue. Other symptoms are weight loss, fever and night sweats.

There are more than sixty types of lymphoma. The prognosis and treatment vary depending on the type of lymphoma, which can be divided roughly into Hodgkin's lymphoma, high-grade and low-grade B-cell lymphomas, and T-cell lymphoma.

In general, lymphoma mainly affects older individuals, making the age distribution similar to that of many other forms of cancer.