There are many reasons for knee pain in children, such as trauma, synovial inflammation, rheumatism and so on, which cause knee pain in children. 1. Consider trauma to this situation, you need to promptly take a film to check whether there is a fracture, if there is no fracture, pay attention to rest, more than 24 hours for the child to pay attention to hot compresses, once for half an hour, twice a day, basically about 5 to 7 days to be able to relieve. 2, considered synovial inflammation, children’s viral, bacterial infection is easy to cause synovial inflammation, like this case, the fluid if not particularly much, should be able to self-absorption, the course of the disease in about two weeks, pay more attention to rest, local hot compresses can be, if there is a significant fluid, can not be self-absorption can be used to aspirate the fluid by way of puncture. 3, there may be streptococcal infection caused by rheumatoid arthritis, then we need to do a blood sedimentation and streptococcal antibody test, if the value is relatively high, you need to use long-acting penicillin to deal with, the earlier the treatment effect is better, some children are not sensitive, may need to maintain treatment for about a year to six months. There are several situations that should be treated symptomatically at the hospital in a timely manner, and only after a clear diagnosis can the party, actively deal with it, so that the child can relieve pain in a timely manner.