Soreness and weakness in the calves may be caused by over-exercise, muscle strain, lumbar disc herniation, etc., and you should consult a doctor in time to find out the cause. 1. Excessive exercise: prolonged high-intensity exercise will cause lactic acid to accumulate in the muscles, stimulating muscle soreness, pain and fatigue. It can be manifested as symptoms such as soreness, tenderness and weakness of calves. 2. Muscle strain: muscle injury due to strenuous exercise, long time standing and excessive weight bearing, etc., excessive pulling of muscles and soft tissues, resulting in aseptic inflammation, which can lead to calf soreness, tenderness, weakness and other symptoms. 3. Lumbar intervertebral disc herniation: mostly caused by trauma, contusion or sprain, leading to rupture of the fibrous ring around the intervertebral disc, the nucleus pulposus breaks through the fibrous ring and bulges out or protrudes, compressing the nerve roots of the lower limbs, which will lead to soreness, tenderness, and weakness of the calves in the area of its innervation. Soreness and weakness in the calves may have other causes, so you should consult a doctor in time to clarify the specific cause and get appropriate treatment if necessary.