Lymphoma Causes:
The exact causes of lymphoma are not known. Several factors have been linked to an increased risk of developing lymphoma, but it is unclear what role they play in the actual development of lymphoma. These risk factors include the following:

• Genetics: Family history of lymphoma
• Viral diseases; such as:
• HIV/AIDS.
• T-cell leukemia/lymphoma virus ( HTLV-1 )
• Epstein-Barr virus ( EBV )
• Inherited immunodeficiency diseases (severe combined immunodeficiency, ataxia telangiectasia, among a host of others).
• Use of immune suppressive therapy (often used following organ transplant).
• Exposure to toxic chemicals.
• Exposure for long periods to insecticides and chemicals.