Although no lifestyle factors have been definitely linked to childhood lymphomas, kids who have received either radiation treatments or chemotherapy for other types of cancer seem to have a higher risk of developing lymphoma later in life.
In most cases, neither parents nor kids have control over the factors that cause lymphomas. Most lymphomas come from non inherited mutations (errors) in the genes of growing blood cells. Regular pediatric checkups can sometimes spot early symptoms of lymphoma in the relatively rare cases where this cancer is linked to an inherited immune problem.
The doctor will check your child's weight and perform a physical examination to look for enlarged lymph nodes and signs of local infection. He or she will also examine your child's chest using a stethoscope and will feel the abdomen to check for pain, organ enlargement, or fluid accumulation.
In addition to doing a physical exam, the doctor will take a medical history by asking you about your child's past health, your family's health, and other issues.
Jonathan L. Powell, MD (2013, April) Childhood Cancer: Lymphoma, KidsHealth.org