Aggressive lymphoma, also known as high-grade lymphoma, is a group of fast growing Non-Hodgkin Lymphoma. Some common symptoms for aggressive lymphoma are weight loss, night sweats, nausea and recurrent fevers. Since these tumors are fast to grow and spread, immediate intervention is required after diagnosis. Aggressive lymphoma accounts for approximately 60 percent of all Non-Hodgkin Lymphoma cases in the United States.