Some patients in the clinic will say that they usually often have fever in the thighs, if the cause of fever in the thighs to find a specific disease, it may be necessary to first determine whether the thighs are really hot, or have this feeling, and the local temperature is normal, the common causes are as follows: 1, if the fever really appears, the measured body temperature is higher than the normal body temperature of the person to exclude whether there is a bacterial infection, such as local septic arthritis or boils, carbuncles,. If the body temperature is normal, it is necessary to check whether there are other diseases, such as neurological diseases, lumbar disc herniation or peripheral neuritis, which may also cause subjective feeling of fever in the thighs. Therefore, to determine what causes the fever in the thighs, it is necessary to determine whether there is really a local fever in the thighs, and then look for the proper cause according to the specific examination and medical history, and give appropriate treatment.