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Dr. Andrew Rynne
MD
Dr. Andrew Rynne

Family Physician

Exp 50 years

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What Causes Black Color Stool During Pregnancy?

Hai, iam kavya 24 yr old and iam 5 months pregnant. from past one weak my motion is in black colour, can i know the reason? iam using tablets in morning for thyroid which is thyroxine sodium tablets of 50mcg and calcium in noon and iron tablets in night.my TSH value is 5.07 . iam using thyroid tablet from past 10 days only. is this the reason for my problem?
Tue, 1 Sep 2015
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OBGYN 's  Response
Hi Ms. Kavya,
The black color in your stool is mostly due to the iron supplements you have been taking. Thyroxine supplements do not cause this color. In fact, it is good to use these supplements once you have been diagnosed with low hormone function especially during pregnancy as there is a risk of low birth weight and preterm labor when the deficiency remains uncorrected. If you did not notice this altered color earlier even while taking iron, please inform your consultant and ask for further evaluation. hope this helps.
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What Causes Black Color Stool During Pregnancy?

Hi Ms. Kavya, The black color in your stool is mostly due to the iron supplements you have been taking. Thyroxine supplements do not cause this color. In fact, it is good to use these supplements once you have been diagnosed with low hormone function especially during pregnancy as there is a risk of low birth weight and preterm labor when the deficiency remains uncorrected. If you did not notice this altered color earlier even while taking iron, please inform your consultant and ask for further evaluation. hope this helps.