Multiple myeloma is a type of cancer that develops in the plasma cells or the white blood cells (WBCs). Healthy plasma cells help combat infections in the body by forming antibodies, which identify and attack germs. Cancerous plasma cells collect in the bone marrow in people with multiple myeloma, crowding the healthy blood cells. Hence, these malignant cells produce abnormal proteins instead of producing antibodies and negatively impact one’s health. Signs of multiple myeloma Weakness or numbness Typically, multiple myeloma is associated with nerve compression, which can cause numbness in the limbs. Hyperviscosity might result in numbness or weakness in the legs, arms, and face. Nerve damage At times, the abnormal proteins generated by the plasma cells are toxic to the nerves. The damage can result in numbness and weakness. It might also trigger a needle-like sensation or peripheral neuropathy. Most people disregard this symptom as routine, but it is important to visit a doctor if the episodes are repeated. Bone pain It is another symptom usually experienced by people with multiple myeloma. Abnormal plasma cells grow in the cortical bone and bone marrow, resulting in generalized bone thinning and local bone damage. It is known as osteoporosis, a condition that makes the bones more susceptible to breakage.