The increase in body temperature after ovulation is caused by the rise in progesterone in the body. The elevated progesterone level excites the thermoregulatory center in the hypothalamus, which leads to an increase in basal body temperature. Generally, the increase is between 0.2-0.8℃, with an average of about 0.3-0.5℃. This increase in body temperature is physiological and does not require any pharmacological treatment or intervention. This physiological increase in body temperature is often used clinically to assess the luteal function of the ovaries. Basal body temperature monitoring is done at the same time every day in the early morning on an empty stomach. If the basal body temperature is maintained for too short a time after each ovulation, it is indicative of inadequate ovarian function. If the high temperature phase persists for a longer period of time, pregnancy or other abnormal factors may be considered. Clinicians sometimes recommend monitoring basal body temperature to assess the presence of ovulatory abnormalities.