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Question

Why did pregnancy trigger my hypothyroidism?

Answer

Natural immune shifts during pregnancy, together with a genetic tendency and other predisposing factors, can trigger hypothyroidism in some women.

Hypothyroidism is an immune disease for most

For 90 percent of Americans, hypothyroidism is caused by Hashimoto’s, an autoimmune disease in which the immune system attacks and destroys the thyroid gland.

The immune system has two major arms of function, one that reacts immediately to an invader, and one that reacts later to produce antibodies. When one of these arms of becomes overly dominant it can trigger an autoimmune disease.

Going into pregnancy predisposed

Pregnancy and the postpartum periods naturally polarize the immune system. In the third trimester the delayed immune response is dominant. Postpartum the immediate immune reaction is stronger.

If a genetically predisposed woman goes into pregnancy with an existing immune imbalance, these natural immune shifts could be the tipping point for Hashimoto’s.

When pregnancy is one stressor too many

Pregnancy can also cause hypothyroid symptoms secondary to chronic stress. Stressors such as gut infections, food intolerances, blood sugar imbalances, and hormonal imbalances can depress the pituitary gland, which controls hormone function in the body. As a result the pituitary fails to signal thyroid activity.

For many women this manifests not only as low thyroid function, but also postpartum depression. Because so many women enter pregnancy dealing with multiple chronic stressors, the increased demands of pregnancy overwhelm the pituitary gland and depress thyroid function.

Balancing health pre-conception lowers risk for mother and baby

A woman should address health and immune imbalances before conceiving to reduce her risk of developing hypothyroidism.

Doing so also may lower the risk of her infant developing eczema, asthma, food allergies, and even autism, which has been found to be caused by an autoimmune disease in many. When the mother’s immune system is healthy and balanced, there’s a stronger possibility her baby’s will be too.