Help! i have burning in left knee and arm?

Nerve disfunction?: Depending on the affected nerves, symptoms of neuropathy can range from a numbness and tingling sensation, possibly a burning sensation, to an uncomfortable painful sensation of the extremities. Neuropathy may affect your digestive system, urinary tract, blood vessels and the heart. For some people, the symptoms are mild; for others, it can be painful and disabling. Have it evaluated and treated.

Need more info: As you pain in only your left arm and left knee, it can be due to peripheral nerve damage or something more serious, best to check with your doctor.