The causes of rheumatism in young people are mainly environmental factors, specific infection factors, hormonal factors, etc., as follows: First, environmental factors, long-term living in a dark and humid environment, or long-term exposure to ultraviolet light, may induce the onset of rheumatism. Second, young people may get rheumatism with some specific infections, such as viruses, bacteria or fungal infections, may induce the onset of rheumatism. Third, rheumatism in young people may have a close relationship with estrogen, as seen in the clinic, the majority of young people with rheumatism are female patients. Fourth, the probability of young people getting rheumatism is also greatly increased, if there is a family history of rheumatism, the probability of the next generation of young people getting rheumatism is greatly increased.