What causes foot and calf soreness?

Foot and calf soreness may be caused by lactic acid accumulation caused by standing for a long time and exercising for a long time. It may also be caused by diseases such as lumbar disc herniation, rheumatism, arthritis, varicose veins of the lower limbs, etc. If the symptoms of foot and calf soreness cannot be relieved after rest, go to the hospital as soon as possible.