Joint pain in children with fever may be caused by fever or by diseases such as juvenile idiopathic arthritis, which can be relieved by general treatment and medication. Fever is a common symptom in childhood, and physical or medication needs to be chosen to reduce fever according to the degree of elevated temperature of the baby. Body temperature <38.5 ℃ can be used to apply warm water to the child's forehead, reduce the wearing of clothing and other physical methods of cooling; body temperature ≥ 38.5 ℃ also need to use ibuprofen, acetaminophen and other drugs under the guidance of the doctor to reduce fever. At the same time, we need to treat the cause of the disease, the specific analysis is as follows: 1. Fever-induced arthralgia: fever will accelerate the body's metabolism, so that the body produces too much lactic acid, causing joint pain, this time we need to pay attention to bed rest, reduce activities, pay attention to light diet, increase the amount of water intake. 2. Juvenile idiopathic arthritis: fever and joint pain will also occur, except for acute fever, do not advocate too much bed rest. It is advisable to encourage children to participate in appropriate sports. Ibuprofen, diclofenac sodium, methotrexate, hydroxychloroquine and other medications should be used if necessary. All of the above drugs should be used under the guidance of the doctor, avoid self-medication. There are many causes of fever and joint pain in children, and it is recommended to seek prompt medical attention for evaluation and management by a specialist.