In a normal menstrual cycle, the hormonal shifts of oestrogen and progesterone govern times of fertility and infertility. The rise in oestrogen at the beginning of the cycle stimulates the cervix to produce a characteristic type of mucus which is clear and stretchy. After ovulation, the rise in progesterone switches off mucus production. The basal body temperature (BBT) shifts in accordance with the changes in hormones.

Tracking the menstrual cycle involves learning to observe the different types of vaginal secretions daily and recording them on a chart.  This can be taught in one session and then monitored in conjunction with acupuncture treatment.

Once the system has been mastered it can be used to reliably predict times of fertility. The chart can be used to monitor gynaecological health, in particular pinpointing hormonal imbalances which can lead to PMS, infertility and miscarriage. Sometimes simple medical treatments designed to cooperate with the cycle such as hormonal support can be used to restore normal cycles and improve fertility.