How to distinguish between yin deficiency and yang deficiency

The main symptoms of yin deficiency are dry throat and mouth, red cheeks, five upset heat, body skin like tidal fluctuations, regular fever, sweating at night and sweating after waking up, body sweating, short urine, red color, dry stool difficult to get down. If kidney yin is involved, it will also show soreness and pain in the waist and knees, dizziness and tinnitus, loose teeth, hair loss. Symptoms of yang deficiency include fear of cold and cold limbs, pale and not ruddy complexion, light mouth or thirst and like to drink hot water, fatigue, shortness of breath and laziness, spontaneous sweating, incomplete stool, clear and long urine, etc. If it involves kidney yang, it will also show obvious fear of cold in lower limbs, general edema, impotence, premature ejaculation, infertility and other manifestations.