Thyroid Disease and Pregnancy
Because these antibodies to the thyroid are more common in pregnancy thus women are more likely than men to have antibodies against the thyroid. And the older your age the frequency of having these antiboties increases, so having a pregnancy when you are older predisposes you to having a pregnancy with thyroid problems. We can explain this greater need for thyroid hormone in pregnancy by several biological mechanisms. The placenta takes some hormone and the fetus takes some thyroid hormone, as well as a need for the increased weight and nutrition of pregnancy for our bodies to accommodate a pregnancy. At 6 weeks of pregnancy there is already evidence of mom's thyroid hormone in the fetus, as the fetus itself doesn't really make it's own until 20 weeks along. So some experts argue that thyroid hormone levels in pregnancy should be thus kept even higher than in the non-pregnant woman. This means a "normal" test may not actually be a normal healthy level of thyroid. Then a group from the University of Texas Southwestern reporting tin the November 2011 American Journal of Obstetrics & Gynecology has now found that the more pregnancies a woman has the more she has elevated antibody levels against components of the thyroid. Specifically it has now been shown that it may be related to certain characteristics of the fetus and what their cells actually were. And the more pregnancies a woman has had the more anti-thhyroid peroxidase antibodies she would have. So those women, with more pregnancies are even more likely to have thyroid problems in pregnancy, and after pregnancy, no matter how long that pregnancy actually lasted. It may be recommended for women who have had a miscarriage to look into their thyroid levels carefully before a next pregnancy.Something else to talk to your gyno about!