Yes, starting Thyronorm (levothyroxine) can temporarily cause your period to be late. Thyroid hormones directly regulate your menstrual cycle. When you begin treatment to correct a thyroid imbalance, your body undergoes hormonal adjustments, which can temporarily disrupt your cycle timing. This is usually a normal part of your body adjusting and should stabilize soon. However, since a delayed period can also be due to stress or potential pregnancy, I recommend taking a home pregnancy test if applicable.
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Can starting Thyronorm 25 cause my period to be late?