Clinically, there are more causes of nervousness and weakness, such as sympathetic excitement, psychological factors, neurasthenia, lack of physical exercise, calcium deficiency, etc.: 1, sympathetic excitement: can be caused by exercise, anxiety, emotional excitement, in addition to the performance of nervousness and weakness, but also can appear panic, palpitations, easy to sweat on the heart of the hands and feet and other symptoms; 2, psychological factors: if the patient usually characterized by easy excitement, easy depression, or lack of social exercise If the patient is prone to extreme performance, after the change of external factors, such as life, work pressure increases, the patient’s relative tolerance is poor, can be manifested as nervous leg weakness; 3, neurasthenia: under long-term tension and pressure, the patient can appear neurasthenia, in addition to nervous leg weakness, but also can be manifested as neural activity weakness, easy fatigue, concentration difficulties and other symptoms; 4, lack of physical exercise: if the patient usually lack of Physical exercise, the muscle strength of the lower limbs is weak, muscle relaxation, weakness, in tension will be manifested as weak legs; 5, calcium deficiency: if the patient’s daily nutritional structure is poor or insufficient food, may lead to calcium deficiency, and then produce osteoporosis, accompanied by tension and weak legs.