Women who have given birth recently or stopped taking hormonal birth control should consult a doctor before using basal body temperature as a method of contraception. It is also advisable to see a doctor while breastfeeding or nearing menopause. Some health conditions make BBT tracking unreliable. Diabetes may lead to fluctuating body temperatures unrelated to ovulation. Hypothyroidism results in insufficient production of hormones that control digestion and metabolism. Raynaud's Disease alters BBT due to spasms or the collapse of blood vessels exposed to cold temperatures. Anemia is common in women of child-bearing age and may lower body temperature. Many women do not realize they have anemia, so experts recommend a basic blood test before starting the BBT-method.
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