Why would my doctor order a thyroid test for abnormal menstural bleeding?

summers

New member
I've had bleeding for a month straight so I went to the doctor to have my birth controll pills changed thinking that was the problem but he ordered a thyroid test and CBC. Why would he need to check this? Thanks just courious my health care is not the best right now and getting answers in a ten minute appoitment isn't easy.
 
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