Swollen legs in the daytime and go away after one night’s sleep may be related to poor circulation in the lower limbs, blood clots, liver and kidney diseases, in addition, patients with cardiac insufficiency may also have swollen legs in the daytime. If the daytime swelling of the legs to sleep overnight, may be related to poor circulation of the lower extremities, due to prolonged standing, less exercise and other factors, resulting in poor circulation of blood in the lower extremities during the daytime activities, belonging to the physiological swelling, at this time the general change of work and rest habits, more walking activities can be relieved. But also need to consult a doctor in time to exclude disease factors, such as lower extremity thrombosis, this time need to carry out lower extremity arterial ultrasound, if there is a thrombus, then you need to carry out low molecular heparin and other anti-embolism treatment in a timely manner. Poor liver and kidney function and cardiac insufficiency, need to carry out timely functional examination, according to the results of the examination to take therapeutic measures. Serious cases need to actively seek medical advice and follow the doctor’s instructions for medication and treatment.