Multiple myeloma is a type of cancer that affects plasma cells, a type of white blood cell found in the bone marrow. In multiple myeloma, abnormal plasma cells multiply uncontrollably, crowding out healthy blood cells and weakening bones. Symptoms include bone pain, weakness, fatigue, frequent infections, and weight loss. While the exact cause is unknown, factors like age, genetic predisposition, and exposure to radiation or certain chemicals may increase the risk. Treatment options include chemotherapy, targeted therapy, immunotherapy, stem cell transplantation, and radiation therapy. Regular monitoring and advancements in treatment have improved outcomes for those with multiple myeloma.