For men, the symptoms of weak legs and weakness: 1, may be caused by low potassium, especially in the summer when sweating is more, it will be manifested as vomiting, diarrhea too much, resulting in the loss of electrolytes in the body, and in serious cases, low potassium, resulting in the symptoms of softness and weakness of both lower limbs, which may also lead to the inability to stand and walk. 2, caused by lumbar spine diseases in men, such as lumbar spine slippage, lumbar spinal stenosis, and even lumbar spine The spinal cord injury caused by fractures can lead to numbness and weakness of both lower limbs. If the spinal cord injury is serious, it may also lead to urinary and fecal incontinence. 3, for men, the previous day after doing strenuous exercise led to the accumulation of lactic acid in the muscles of the lower extremities, stimulating the muscles resulting in pain, soreness, weakness, there will be significant relief after rest. If there is no significant relief or progressive aggravation within a short period of time, you must go to a regular hospital in time to improve the relevant examination and choose a more reasonable treatment method after a clear diagnosis.