Children are less able to fight against weather changes than adults and are more prone to colds and lowered immunity during the change of seasons. Most parents are more aware of colds and can react promptly to symptoms such as stuffy nose, runny nose and sore throat, but they lack corresponding knowledge and understanding of lesions in other tissues and organs. Pediatricians often encounter such children when the seasons change. Some children will tell their mothers that their knees hurt, some children have their hands over their groins, cry loudly and painfully, and are unwilling to even go down to the floor, some children have a self-expressed expression and move freely, but when you look closely, they walk with a slight limp, and some children have no symptoms at all, but they just don’t want to stand, they just lie on the bed or sit on the sofa, and they don’t want to squat on the toilet. If your child has some of the above symptoms, and about 2 weeks before your child has these symptoms, your child has also had symptoms of a cold such as a stuffy nose, runny nose, sore throat, or your child has fallen or been injured during activities, you may need to be especially careful because these are some signs of inflammation in the hip joint. One of the most common is temporary hip synovitis. Temporary hip synovitis is a non-specific inflammatory disease that is often associated with viral infections, bacterial infections, trauma and allergic reactions. The onset of the disease may be preceded by upper respiratory tract infections, with mild pain in the knee and anterior medial thigh. Its pathological changes are synovial congestion, edema, exudation, synovial hyperplasia and joint effusion. Its treatment mainly includes bed rest, lower limb traction, anti-inflammatory, anti-swelling and other symptomatic supportive treatments. It must be mentioned that the above symptoms are not only seen in children with temporary hip synovitis, there is another disease that needs to be identified with it, and that is ischemic necrosis of the femoral head in children, internationally known as Legg-calve-perthes disease. Therefore, in the diagnosis of temporary hip synovitis, we need the child to undergo pelvic radiographs and other tests to differentiate from it. If temporary hip synovitis is detected, diagnosed and treated early, its prognosis is good and it usually does not recur or leave sequelae. After two to three weeks of treatment, your child will be able to move around normally!