With numerous advancements in early detection and multi-modal therapy, cancer has become a chronic disease. As the number of cancer survivors continue to increase, physiatrists and other neuromuscular disease specialists are more likely to encounter individuals with residual impairments, disabilities, and/or handicaps resulting from cancer or related treatments. The cancer patient is especially prone to injury directed at the peripheral nervous system at multiple anatomic levels. Tumors can directly compress or infiltrate vital nervous system structures, or can cause severe neuromuscular disorders through a paraneoplastic process. Immunocompromised cancer patients are susceptible to indirect neurologic insult through secondary mechanisms such as infection or metabolic disorders. Cancer treatments themselves; including surgery, chemotherapy, radiation therapy, and hematopoietic stem cell transplant; can result in a wide variety of neuromuscular complications with a wide range of symptom and functional severity. Electrodiagnosis is an invaluable tool in the evaluation of neuromuscular disorders in this patient population.