The symptoms of soreness and swelling in the calves at night are commonly caused by venous stasis, lumbar disc herniation, lower limb vascular lesions and so on, as follows: first, calf venous stasis: excessive strain on the calf muscles during the daytime causes venous stasis at night, which causes soreness and swelling in the calves, mainly related to prolonged excessive weight bearing and exercise; second, lumbar disc herniation: lumbar disc herniation compresses the nerves, which can make the calf nerves The soreness and swelling in the dominant area can occur at night and is usually in the early and middle stages of lumbar disc herniation; third, lower limb vascular lesions: such as venous thrombosis or varicose veins can also lead to soreness and swelling in the lower leg and pain in the lower leg when pressed. Through detailed physical examination and ultrasound examination, the cause of most calf soreness and swelling can be found. After the cause is diagnosed, the symptoms can be relieved with appropriate treatment. The exercise of calf muscles should be strengthened to prevent the recurrence of symptoms.