There are two reasons for cold lumbar and cold hip: 1. Due to excessive sitting time resulting in the muscles in the lumbar and hip positions as well as other soft tissues showing excessive tension, strain and fatigue, resulting in the accumulation and increase of metabolites, such as inflammatory metabolites and lactic acid. Stimulation of peripheral circulation can occur, leading to constriction of small veins, resulting in a further increase in inflammatory metabolites. The stimulation and contraction of the small arteries will lead to a decrease in the supply of local energy, nutrients and electrolytes, so that the local energy will be reduced and the performance of chills will appear. 2. Due to the lack of clothing covering the waist and hip position, the thin clothes worn are easy to get cold, especially in the sitting position when the waist is very easily exposed, which will lead to a drop in local temperature. In the sitting position, if the bench is cold, it will also lead to cold hips, so it is all due to the lack of attention to warmth.