The back is the route of the solar meridian. 1. Cold in the back is due to the invasion of the solar meridian by cold evil. 2. Yang Qi plays a warming role in the body, and a deficiency of Yang Qi is unable to maintain the local muscles and meridians, resulting in local cold. 3. Trauma and other factors lead to local stagnation of Qi and blood, coupled with the weakness of Yang Qi, which cannot be transported to the local area. 4. Due to the deficiency of Qi and blood after childbirth, the wind, cold and dampness invade the lungs. For the back chill caused by the wind-cold evil, you can use some medicines to relieve the cold, or cupping physiotherapy. For those who are weak in yang energy, you can choose moxibustion physiotherapy. For women with postpartum Qi and blood deficiency caused by postpartum Qi and blood deficiency, together with herbal soup and acupuncture treatment, pay attention to local warmth.