Kidney deficiency can be analyzed comprehensively by clinical symptoms, tongue and pulse to distinguish whether it belongs to yang or yin deficiency. Clinical symptoms: Kidney yang deficiency symptoms include dizziness, white or black color, lumbar and knee soreness and weakness (the feeling of lumbar and knee soreness and weakness), fear of cold, loss of libido, and mental depression. Symptoms of Kidney-Yin deficiency include soreness and weakness of the waist and knees, dizziness, tinnitus, loose teeth, hot flashes (a burst of heat), night sweating (abnormal sweating after going to sleep and stopping after waking up), and so on. Tongue: Kidney-Yang deficiency is a pale tongue with white moss; Kidney-Yin deficiency is a red tongue with little moss. Pulse: In Kidney-Yang deficiency, the pulse is thin and weak; in Kidney-Yin deficiency, the pulse is fine (the pulse becomes narrower, thinner and faster). Seek prompt medical attention for the symptoms of Kidney-Yang or Kidney-Yin deficiency.