Back hip coolness may physiological reasons, dermatoneuritis, lumbar disc herniation, lumbar back myofasciitis, ankylosing spondylitis, rheumatoid arthritis. 1. Physiological reasons: may live to relieve dampness and cold, feel the wind cold can cause local cool feeling. Symptoms can be relieved by keeping warm and applying hot compresses. 2. Dermal neuritis: may be caused by drug poisoning, vitamin deficiency, mainly manifested as sensory impairment, localized cold, soreness, numbness, the application of nutritive nerve drugs, such as methylcobalamin capsules can be relieved. 3. Lumbar disc herniation: the herniated compressed nerve can radiate to the lumbar and hip area, causing local sensory disorder, manifested as coolness, which needs to be clarified by CT or magnetic resonance examination. 4. Myofasciitis of lumbar back: Myofasciitis is caused by strain injury or wind-cold sensation, and the lower back and buttocks are cool and swishy. 5. Ankylosing spondylitis: mainly manifested as nighttime pain in the lower back, morning stiffness, and a cool feeling. 6. Rheumatoid arthritis: due to synovial membrane hyperplasia and hypertrophy of the spinal joints, there is a cool whooshing sensation and pain in the lower back and buttocks. There are many reasons for the cool whooshing sensation in the lower back, if it is difficult to relieve, should be examined and treated under the guidance of a doctor.