Changes in Body Temperature Before Menstruation

The variation in body temperature prior to menstruation primarily hinges on the progesterone levels within a woman's body. Typically, there is an elevation in body temperature leading up to menstruation, followed by a decline approximately 1-2 days before the onset of menstrual bleeding.

Elevated Temperature During the Luteal Phase

After the ovulation phase, a woman enters the luteal phase, during which progesterone levels gradually increase. This surge in progesterone results in a slight rise in body temperature by approximately 0.3~0.5°C above the basal body temperature. This elevated temperature persists until menstruation commences. If conception occurs post-ovulation, the corpus luteum continues to secrete estrogen and progesterone, supporting embryonic development and potentially maintaining a slightly higher body temperature.

Decline in Temperature Before Menstruation

In the absence of pregnancy, progesterone levels notably decrease 1-2 days prior to menstruation. This hormonal shift triggers a drop in body temperature, reverting to basal levels. This temperature variation is part of the body's preparation for a new menstrual cycle.

The Role of Temperature Curves

By measuring and recording daily body temperatures, women can plot temperature curves. These curves facilitate understanding menstrual cycles and aid in estimating ovulation timing. A sustained elevation in temperature for over 16 days post-ovulation may indicate pregnancy. Conversely, a temperature drop before menstruation signals non-pregnancy.

Practical Applications and Recommendations

Understanding temperature variations is invaluable for women seeking pregnancy or contraception. Measuring basal body temperature first thing in the morning, upon waking, ensures the most accurate readings. Dedicated basal thermometers are recommended for enhanced precision over standard thermometers.

Other Influencing Factors

Body temperature is not solely influenced by progesterone but can be disrupted by various factors, including colds, late nights, alcohol consumption, and emotional fluctuations. Maintaining a regular lifestyle and avoiding unnecessary disturbances is advisable when tracking temperature changes.

By comprehending the fluctuations in body temperature across menstrual cycles, women can gain better insight into their physiological state. This knowledge not only aids in pregnancy planning or contraception but also facilitates early detection of abnormalities for proactive health management.