Hi, Thanks for writing in. Lymphoma is a neoplastic condition of the lymphatic system. It is mainly a cancer of white blood cells. There is no single type of lymphoma and many types exist depending on the type of abnormal cell proliferation which is found on histopathological examination. The symptoms are unexplained weight loss of more than 10 percent over past 2 months with nightsweats and fever which has not showed any significant cause after doing routine testing. Many patients show painless lumps in the armpit, neck and other places where lymph nodes exist. Rarely lymphomas might also originate as lumps in any organ of the body. It might also affect bones in few patients. The spleen is usually enlarged in most patients of lymphoma. There might be abdominal pain from lymph nodes or enlargement of the spleen. Some of the lymphoma patients have occult disease and the symptoms stay undetected until it has manifested in to later stages. If your doctors have examined you and confirmed that the lymph nodes are prominent due to you being slim then you do not lymphoma. Please do not worry.