Because cancer can occur almost anywhere in the body, the symptoms and particular disabling effects will vary greatly among individual students.  Some people experience visual problems, lack of coordination, joint pain, backaches, headaches, and other symptoms.  The primary treatments for cancer (radiation therapy, chemotherapy, an surgery) may cause additional effects.  Radiation treatment can cause nausea, drowsiness, and fatigue, all of which may impact the student's academic functioning or cause absences.