The pain after the lumbar hot compress may be due to the following reasons: 1, is due to the lumbar sprain, and the patient carried out the hot compress, will only make the pain situation aggravated, if the lumbar sprain of this situation in the early stage is the acute stage, must be given cold compress to deal with, so that can play the role of analgesia and swelling, to the late stage can be local hot compress. 2, also It may be caused by a herniated lumbar disc, which leads to edema after the nerve is compressed, and if the patient applies heat locally, it will make the compressed lumbar nerve and the soft tissue around the lumbar spine significantly more edematous, which will aggravate the pain symptoms. When this happens, it is best to advise the patient to go to the hospital for a timely examination.