Common symptoms of yin and yang deficiency include fatigue, mental weakness, memory loss, special fear of cold, cold limbs, heavy body, reduced sexual function, impotence, premature ejaculation, prostatitis, long and clear urine, frequent nocturnal urination, hearing loss, poor memory, daytime sleepiness, sweating, and a tendency to suffer from back pain and joint pain. Some people may even have diarrhea at the fifth hour, which is when they get up at around five o’clock in the morning, and others may have body pains or premature graying of hair, which are all manifestations of yin and yang deficiency, and can be prescribed by experienced Chinese herbalists.