Coldness in the lower back may be related to lumbar muscle strain, cold and anemia. 1. Lumbar muscle strain: Keeping the same position for a long time or engaging in heavy labor may lead to muscle strain in the lumbar region, which affects the local blood circulation and leads to symptoms such as coldness in the lower back. 2. Cold: Cold weather and failure to add clothes in time according to the change of temperature may lead to lumbar cold, which will also affect the local blood circulation. 3. Anemia: Lack of iron, vitamin B12 and other nutrients in the body may lead to anemia, which affects blood circulation in the whole body and is also prone to coldness in the lower back. There may be other clinical reasons for the coldness of the lower back. If the symptoms persist, it is recommended to go to the hospital to clarify the cause.