Thyroid and my Cycle

Tracking BBT over time lets you get to know your normal. Tracking BBT tracks, spots and flags abnormal temperature data – and will show you when you have unusually high or low relative change in basal body temperature (see graphic). If your basal body temperature reaches more than 37.8°C (100.4°F) degrees, the "DaysyDay" app will advise you to check if you have a fever. If the temperature is lower than 35°C (95°F) degrees, the "DaysyDay" app will also inform you that an unusually low temperature has been measured. It is described that a relatively low basal body temperature (below 36°C / 97°F) is associated with a possible hypothyroidism. Hypothyroidism means that your body is not sufficiently supplied with the thyroid hormones thyroxine (T4) and triiodothyronine (T3). In the case of hypothyroidism, the basal body temperature is usually lower than normal. BBT is a good indicator because its less noisy then other types of measurements. Measuring over time will highlight abnormalities.

Other indicators, dependent on the severity of thyroid disease, include:

  • infrequent periods or amenorrhoea (could also cause more frequent periods)
  • prolonged heavy periods
  • irregular cycles
  • anovulatory cycles (monophasic charts) or short luteal phases
  • temperature fluctuations
  • low waking temperatures

Treatment with thyroxine typically gives almost immediate relief from symptoms.  If your hypothyroidism is treated (e.g. with thyroxine and possibly together with T3 drugs), your basal body temperature is probably still slightly lower than average (see figures a and c), but this does not impact your ability to use Daysy successfully. Daysy adapts to your individual cycle and your personal basal body temperature.

In general: If you feel that you are suffering from a thyroid dysfunction (Hypothyroidism), this should be discussed with your health care provider.

BBT with medical treatment

Daysy - Your personal fertility tracker (incl. app DaysyDay)
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Daysy is an intelligent fertility tracker that lets you get to know your very own menstrual cycle.