How does kidney deficiency occur?

Kidney deficiency refers to the pathological state of deficiency of kidney qi and yin. There are many kinds of kidney deficiency, among which kidney yin deficiency, kidney yang deficiency and kidney qi deficiency are the most common. Kidney deficiency has many causes, such as congenital kidney deficiency, fatigue, excessive exercise, overeating, not paying attention to warmth, abusing antibiotics, staying up for a long time, excessive desire, old age, long-term illness, etc. The symptoms of kidney-yang deficiency are chills, accompanied by weakness of waist and knees, cold waist, cold limbs, decreased libido, decreased urination frequency, male impotence, female cold infertility, irregular menstruation, etc. The main manifestations of kidney-yin deficiency are waist soreness, hot flush, night sweat, dizziness, tinnitus, insomnia, less moss or no moss, less pulse, etc. Meanwhile, women can show decreased menstruation, abnormal menstrual cycle, etc.