Thigh root pain in children may be caused by muscle strain, hip inflammation and inguinal hernia. 1. Muscle strain: If a child has a strenuous exercise before thigh pain, it is considered to be a limited muscle strain, which is usually not accompanied by fever, swelling and other symptoms. 2. Hip inflammation: children’s thigh pain may also be caused by local inflammation, such as hip arthritis, children’s thigh root pain, in addition to local redness, swelling, fever. Parents need to take their children to the hospital in time, after a clear diagnosis for standardized treatment. 3. Inguinal hernia: some children have inguinal dysplasia, excessive crying can cause inguinal hernia, usually manifested as a lump in the groin, and swelling, pain, parents need to take their children to the doctor. There are other causes of thigh pain in children, and it is recommended that parents take their children to the hospital to clarify the cause of the disease and standardize the treatment.