Multiple myeloma is a common malignant tumor of the blood system. There are many causes of malignant tumors, among which there are three main factors, as follows: 1, chemical factors: mainly including various drugs, chemicals, pesticides and some fuels, such as xylene, which has been proven to be a strong carcinogen, and hair dyes used in daily life or various glues or chemical solvents used in home decoration. These are strong carcinogens; 2. Physical factors: mainly refers to various kinds of radiation, such as nuclear radiation, X-rays, microwave radiation, ionizing radiation, etc.; 3. Biological factors: mainly refers to various viruses, such as hepatitis B virus, hepatitis C virus, cytomegalovirus, human papillomavirus, etc.