Multiple myeloma is a type of cancer that affects plasma cells, which are a kind of white blood cell found in the bone marrow. These cells produce antibodies that help the body fight infections. In multiple myeloma, abnormal plasma cells grow uncontrollably, leading to a decrease in healthy blood cells and a weakened immune system. Symptoms of multiple myeloma can include bone pain, fatigue, and frequent infections. The disease can also cause complications such as kidney damage and anemia. Treatment options may involve chemotherapy, targeted therapy, or stem cell transplants to manage the condition and improve quality of life.