Pathology of the Kidney
Kidney Yin Deficiency
Kidney Yin is fundamental for the Yin in the entire body. Kidney Yin Deficiency frequently causes Yin Deficiency in other organs. Kidney Yin Deficiency can cause Heat, especially Heart Fire or Liver Fire. Since Kidney Yin nourishes Kidney Yang, Kidney Yin Deficiency can appear in combination with Kidney Yang Deficiency. This dual pattern is commonly encountered.

Cardinal symptoms Night sweat, dark-scanty urine, dry mouth at night, aversion to heat, tidal heat, warm feet, five center heat, red cheeks, vertigo, forgetfulness, sexual over-excitability, restlessness, nocturnal emissions, lumbar pain better with cold, seminal emissions, tinnitus, deafness, red or cracked tongue.
TCM Information Symptoms, causes, treatment tips, root and branch, point-combination

Pathogenesis of selected symptoms
Vertigo, slowly incipient, slight Vertigo originates because Kidney Yin fails to sufficiently nourish and fill the brain with marrow. Forgetfulness Forgetfulness originates because Kidney Yin fails to sufficiently nourish and fill the brain with marrow. Deafness Deafness originates because the Kidney Yin fails to nourish the ears. Night sweat Defense-Wei-Qi circulates on the body-surface during the day, and moves back into the Yin organs at night. Kidney Yin Deficiency causes the internal Heat to increase. During the night, the internal Heat is reinforced by the Defense-Wei-Qi, driving the Body Fluids out of the body. Dry mouth in the evening Dryness of the mouth originates because of Kidney Yin Deficiency, and the moistening function cannot be maintained. The dryness of the mouth is more noticeable in the evening because Yang moves into Yin at night and therefore the internal heat increases at night and dries out the body liquids. Five center heat The five centers, sometimes referred to as the five hearts, include the soles of the feet, the palms of the hands, and the center of the chest. The cooling function of the Kidneys is restricted due to Kidney Yin Deficiency and the Yang excessively warms the body. Aversion tot heat Aversion to heat originates because the cooling function of the Kidneys is restricted due to Kidney Yin Deficiency, and the Yang excessively warms the body. Since internal Heat has increased, external Heat can be less tolerated. Restlessness Restlessness originates because the Spirit is not rooted due to Kidney Yin Deficiency. Pain in the lumbar area Pain in the lumbar area originates when the bones lack the nourishment and support provided by the Kidneys' Yin. Bone pain Bone pain originates because the bones lack the nourishment and support provided by the Kidneys' Yin. Sexual over-excitability Sexual over-excitability originates because the activity of the Yang dominates in Kidney Yin Deficiency. Nocturnal emission Nocturnal emission originates because the deficient Kidney Yin is not able to restrain the Yang at night. Seminal emission Seminal emission originates because the activity of the Yang dominates in Kidney Yin Deficiency and sexual over-stimulation takes place. Dark, scanty urine Dark, scanty urine originates, because the Body Fluids decrease in the Kidney Yin Deficiency and Heat concentrates in the urine. Osteoporosis Osteoporosis originates when the bones lack the nourishment and support provided by the Kidney Yin.