Soreness in the legs and stomach may be related to excessive leg exercise, overworked leg muscles, muscle tension, and increased excess metabolites. It may also be related to certain diseases in the legs, such as deep vein thrombosis in the legs or varicose veins in the legs, which cause impaired blood circulation in the legs and soreness due to blood stagnation in the legs. Legs remain in the same position for a long time, leg veins are pressurized and blood flow is obstructed, which can also cause soreness and swelling in the legs and stomach. You can do local massage, hot compresses, and activities of the lower limbs to promote local blood circulation to see if it can improve. If no improvement is seen, it is recommended to go to the hospital for a checkup to rule out whether it is caused by leg diseases.