Q&A Index

Factors that affect temperatures

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What factors influence my basal body temperature (BBT)?

There are certain factors that can influence your basal body temperature. These should be noted in the notes section of Fertility Friend or checked on the checklist/specifics on the data entry page.

These factors will usually not make charting and chart analysis impossible, especially if they occur only rarely, though it may be more challenging. In most cases, even when these factors apply on an ongoing basis, they will not skew your data so much that reading the chart is impossible. It is important to make a note of the factors, however to help with the interpretation of the chart. The following factors may influence your BBT:

  • fever
  • illness and infections (even those that do not produce a fever)
  • cold, sore throat
  • drugs and medications
  • alcohol (especially in large quantities, though all alcohol consumption should be recorded)
  • smoking (if you smoke, you should consider quitting before you are even pregnant)
  • emotional stress
  • physical stress
  • excitement
  • sleep disturbances (insomnia, night-waking, upsetting dreams, poor sleep)
  • change in waking time
  • jet lag
  • travel
  • change of climate
  • use of electric blanket
  • change of room temperature
  • recently discontinuing birth control pills
  • breastfeeding

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