The symptoms of lumbar and knee weakness in women may have the following conditions, which need to be divided into physiological and pathological causes according to age. For example, when it occurs in women around the age of 50, it is considered a normal physiological phenomenon caused by changes in hormone levels in the body during menopause and can be improved by hormonal medication. However, in non-menopausal women, there are more causes, including calcium deficiency, nutritional deficiency, strain, etc. Women who experience back and knee weakness need to be judged in the context of their recent dietary habits. If there is a long period of irregular diet and irregular rest, nutritional deficiencies can be considered, and can be improved by adjusting the diet and rest schedule. If there is no significant change in diet and rest, it is necessary to check the calcium content of bones to understand whether it is caused by calcium deficiency, which can be improved by calcium supplementation. The usual need to strengthen physical exercise, can enhance physical fitness.