There are many reasons for foot soreness and weakness, common reasons are overwork, varicose veins, lumbar intervertebral disc herniation. 1. Overwork: If you walk for a long time, the muscles and ligaments of your feet will be under tension for a long time, which will lead to the accumulation of a large amount of lactic acid, and your feet will become sore and weak, accompanied by generalized weakness, muscle pain, and other symptoms. 2. Varicose veins: blood circulation in the lower limbs is impaired, the amount of blood returning to the heart is reduced, and the feet are in a congested state, leading to a decrease in the level of material metabolism in the feet, and the accumulation of acidic metabolites, which leads to foot pain and weakness, and in the long run, there will be generalized fatigue and weakness. 3. Lumbar disc herniation: lumbar disc herniation compresses the nerves, resulting in numbness and weakness of the feet, and the symptoms are aggravated after activities, accompanied by fatigue and tiredness. Sore feet, body weakness, weakness, tiredness, there are other reasons, such as osteoarthritis, fatigue syndrome, etc., it is recommended to go to the hospital in a timely manner, improve the examination to clarify the cause of the disease, and then give targeted treatment or treatment.