Left back cold pain, hot compress will be better may be lumbar degenerative diseases, lumbar muscle strain, renal artery stenosis or spasm and other diseases caused. 1. Lumbar degenerative diseases: mostly seen in lumbar degeneration caused by lumbar disc herniation, lumbar spinal stenosis and other diseases, the patient’s nerves and blood vessels are compressed, thus causing the patient to experience coldness in the waist. Hot compresses can promote local blood circulation, thus improving the symptoms. 2. Lumbar muscle strain: due to prolonged lumbar strain, resulting in lumbar muscle and other tissue damage, capillary contraction and other causes of insufficient local blood supply, the patient may appear cold feeling, pain. Hot compresses can promote local blood circulation, which can help improve the symptoms of coldness and pain in the waist. 3. Renal artery stenosis or spasm: renal artery stenosis or spasm caused by renal ischemia, lack of oxygen, and reflected to the back of the back, the patient may appear back of the back of the pain discomfort, cold symptoms. Arterial spasm can be relieved in some patients after hot compresses, thus causing symptomatic relief. Left back back cold pain, hot compresses will be better may also have other reasons, it is recommended to go to the hospital in a timely manner, improve the examination to clarify the cause of the disease, give targeted treatment or treatment.