Heredity: Prenatal Jing/Ancestral (Yuan) Qi of each individual is formed at the moment of conception from a combination of the parents' Jing, both in general, and especially at conception. If parents had unhealthy or weak Jing (perhaps also inherited), or if conception occurred when they were too old or exhausted, the offspring could have a weak constitution.
Emotions: The Kidneys in Five Element theory correspond to Water, which is associated with fear, anxiety, and shock. Fear descends Qi. Kidney rules the two lower orifices, control of which is often lost during bouts of extreme fear. Fear in children can cause enuresis. In adults, fear tends to deplete the Yin of the Kidneys and cause Kidney Yin Deficiency that may lead to Heart Yin Deficiency.
Excessive Sexual Activity: Weakens Kidney energy, especially in men, since ejaculation depletes Kidney Jing. The Heart is directly related to Kidneys in that they mutually support an nourish each other. Therefore, weak Kidneys can weaken the Heart. Conversely, Deficient Heart Qi from sadness and/or anxiety can weaken Kidneys causing impotence, frigidity, inability to have orgasm.
Chronic Disease: Most chronic disease eventually weakens the Kidneys, causing Deficiency of Kidney Yin or Yang.
Aging: Kidney Jing declines with age
Physical Overwork: Weakens Kidney Yang
Mental Overwork: Weakens Kidney Yin (very common in Western culture).
As we use Kidney Yang energy in physical labor, the Postnatal Jing (derived from food and drink by the Spleen) replaces this quickly. However, if one has a lifestyle of stress, constant activity, long hours, irregular eating habits, excess mental activity, etc. with not enough time allowed for the body to rejuvenate, all this weakens the deeper Yin energy, which is less easily replaced. Worry and anxiety can lead to Empty Heat.
Kidney Jing Deficiency
Slow mental and physical development in children
Late or incomplete fontanel closure in infants
Poor skeletal development and brittle bones
Soreness and weakness in the lumbar area and knees
Premature graying and hair loss
Dental and teeth problems
Depleted Sea of marrow
Mental retardation, poor memory
Premature aging and senility
Dizziness, deafness and tinnitus
Low sex drive, infertility
Variable with deficient Yin or Yang
Yin is usually more Deficient presenting with a red peeled Tongue
Possible Floating/Empty or Leather Pulse
Overlapping Western medicine conditions:
Impotence, frigidity, infertility, arthritis, slow physical and mental development in children, tinnitus, premature senility.
It is assumed that Yin and Yang are equally Deficient, and there are no additional Signs of Heat or Cold, (never happens in clinical practice)
Signs include those of major life processes presided over by Jing, (birth, development, reproduction and aging) with specific reference to systems ruled by the Kidney.
Kidney Yang Deficiency
Chills and aversion to Cold, Cold limbs, bright
pale face, apathy, lethargy
Soreness and Cold in the lumbar region
Weakness and Cold of knees
Kidney Yang fails to hold fluids
Low sex drive, impotence, or frigidity
Copious clear urine,
Frequent urination or incontinence
Kidney Yang fails to circulate fluids
Reduced urine and edema
Kidney Yang fails to warm the Spleen
Loose stool, especially early AM (cock's crow diarrhea)