The sore legs and weakness are caused by the following factors: 1, for example, from the perspective of Chinese medicine, the body is too weak and causes sore legs and weakness. 2, from the perspective of Western medicine, the causes of sore legs and weakness are, for example, ionic disorders, sore legs and weakness when hypokalemia and hyponatremia, excessive accumulation of lactic acid in the body when exercising too much, and lactic acid will accumulate in the more developed muscles of the lower limbs. 3. Clinical symptoms and states of leg acidity and weakness can occur when there is incorrect exercise, incorrect method and rhabdomyolysis, or heat cramps and heat exhaustion due to heat stroke. 4. In case of sacroiliac arthritis, lumbar disc herniation, or lumbar disc bulge, clinical manifestations of leg pain and weakness may also occur.