One of the most famous Classics of Chinese Medicine the Huangdi Nei Jing, often translated as The Yellow Emperor’s Canon of Medicine, begins with a question from the wise Yellow Emperor to his chief physician.
Menstruation
One way to understand what is happening during the menstrual cycle is to track the basal body temperature over a number of cycles.This tells us when ovulation is most likely to have occurred and will also give indications on why it might not have happened.