Lower limb swelling due to prolonged sitting may be due to physiological factors, varicose veins of the lower limbs, etc. It can be relieved by changing posture, increasing exercise, medication and surgery. 1. Physiological factors: prolonged sitting will lead to poor lymphatic fluid and blood return, which will lead to swelling of the lower limbs. Afterwards, you can avoid sitting for a long time, stand up and move regularly to relieve the swelling of lower limbs, and also elevate the lower limbs to promote the recovery of swelling. 2. Varicose veins of the lower limbs: prolonged sitting or standing can lead to varicose veins of the lower limbs, causing swelling of the lower limbs. Avoid prolonged sitting or standing in daily life to prevent the disease from worsening. You can buy regular compression stockings to promote blood return and reduce the symptoms of lower limb swelling. If the condition is serious, surgical treatment is necessary. Prolonged sitting posture leads to swelling of the lower limbs for a long time can not be recovered, may be caused by disease. Patients need to consult a doctor as soon as possible, under the guidance of a professional doctor to standardize the treatment.