Kidney deficiency refers to the imbalance of yin and yang in the kidneys, where yin and yang cannot be kept in balance, resulting in obstruction of the flow of qi and blood in the kidneys and poor meridian flow. Kidney deficiency does not differentiate between men and women, the causes of kidney deficiency in men and women are more or less the same, but the clinical symptoms are very different. Whether a woman has kidney deficiency or not can be obtained by observation of menstruation and the lower band. When a woman is a teenager, if her menstruation comes on time, it means that her kidney energy is sufficient. However, if the period does not arrive beyond the age, or if the first period is late, low in volume, or even amenorrhea occurs, then it indicates an innate deficiency of kidney qi and a kidney deficiency. If menstruation comes early and is heavy and reddish in color, it is generally a symptom of Kidney Yin deficiency and is usually accompanied by soreness and weakness of the waist and knees. If the menstruation is delayed and weak, it is a symptom of kidney yang deficiency. If the timing of menstruation is uncertain, sometimes early and sometimes late, it indicates a deficiency of the liver and kidney. Most of the kidney deficiency is caused by the latter. Modern people work under great pressure, and the kidney energy is depleted excessively and not replenished timely and effectively. In daily life, you should work and live regularly, while not to indulge in sex, diet should be scientific, you can eat more black food.