Women with weak back and knees and weakness are usually caused by the following reasons: 1, from the perspective of Chinese medicine, it is caused by deficiency, usually kidney deficiency, qi deficiency, blood deficiency, spleen deficiency, etc., you can take warm tonic drugs to nourish qi, blood, nourish yin and kidney, which can play a very good effect; 2, women with weak back and knees accompanied by weakness, from the perspective of Western medicine, it is caused by endocrine diseases, such as endocrine disorders In Western medicine, endocrine disorders such as endocrine disorders, internal environmental disorders, premature ovarian failure, such as during menopause and puberty, unbalanced secretion of estrogen and progesterone in the body can also cause symptoms of weakness and weakness; 3, ion disorders such as low potassium, low sodium and low chloride can also lead to weakness and weakness; 4, common female diseases such as coronary atherosclerotic heart disease, myocardial ischemia, insufficient blood supply to the heart, myocarditis, can also cause weakness and weakness of the waist and knees 4, common female diseases such as coronary artery atherosclerosis, myocardial ischemia, lack of blood supply to the heart, myocarditis, can also cause weakness in the back and knees, weakness in the body along with chest tightness and shortness of breath.