When resting in bed, the legs have soreness symptoms, the reasons are as follows: First, after resting in bed, the calf muscles and thigh muscles will be fully rested and relaxed, so the muscles cannot normally contract and stretch to promote lower limb venous return, venous blood in a short period of time will still accumulate in the lower limb muscles, acidic metabolites stimulate the nerves in the muscles will cause soreness symptoms, and when standing or walking calf muscles and thigh muscles continue to The contraction and diastole of the calf muscles and thigh muscles while standing or walking can promote venous reflux in the lower limbs and reduce the accumulation of acidic metabolites in the muscles, thus reducing the symptoms of soreness in the legs. Secondly, when standing for work or labor, attention is often more focused, easy to ignore the symptoms of mild leg pain, and after resting in bed, attention is easily focused on the symptoms of leg pain and discomfort.