Medications that are used to treat an overactive thyroid (hyperthyroidism) may cause hypothyroidism. These drugs include methimazole (Tapazole) and propylthiouracil (PTU). The psychiatric medication, lithium (Eskalith, Lithobid), is also known to alter thyroid function and cause hypothyroidism. Interestingly, drugs containing a large amount of iodine such as amiodarone (Cordarone), potassium iodide (SSKI, Pima), and Lugol's solution can cause changes in thyroid function, which may result in low blood levels of thyroid hormone.
Stress can also be caused by chronic digestive issues. When the small or large intestine is in distress (ywhen you are always constipated, bloated, suffer from gas, pain, loose stool etc.), the body sees it as a state of stress. Cortisol is a potent hormone we won’t function without. However, when in excess, it can have a detrimental impact on the thyroid and the immune system (one of the functions of cortisol is to modulate the immune system).
The NIH studied the link between hypothyroidism and small intestine problems. These problems included an overgrowth of bacteria, such as yeast. Probiotic supplements contain live bacteria that can help keep your stomach and intestines healthy. Besides supplement forms, fermented food and drink, such as kefir, kombucha, raw cheese, and yogurt contain useful probiotics.
One root vegetable that is the exception, and which can negatively impact an underactive thyroid is cassava, a common staple in certain parts of Africa. This plant “is known to produce toxins that can slow an already underactive thyroid,” Dr. Nasr says. But, “that’s not relevant here in the United States, unless you cook cassava and you eat it every day.”
People should take T4 on an empty stomach to prevent the absorption of the medication from being erratic. Moreover, doctors usually recommend taking the medication first thing in the morning, then waiting at least an hour to eat breakfast or drink coffee. Taking the medication at bedtime, several hours after the last meal, also appears to work and may be a more convenient approach for some people.
In the 1995 American Thyroid Association (ATA) guidelines, biological and synthetic thyroid hormone preparations containing T4 plus T3 were not recommended out of concern for fluctuating and often elevated serum T3 concentrations (71). In conjunction with the American Association of Clinical Endocrinologists in 2012, the ATA continued to recommend l-thyroxine monotherapy and noted that evidence does not support using synthetic combination therapies; in addition, they stated that “desiccated thyroid hormone should not be used for the treatment of hypothyroidism” (72). In 2014, the ATA recommendations evolved with the recognition that 1) serum T3 levels might not be normalized in all l-thyroxine–treated hypothyroid patients and 2) some patients remain symptomatic while receiving l-thyroxine monotherapy. Titration of l-thyroxine dose to achieve normal TSH concentrations remains a first-line approach, but trials with combination therapy can be considered. In addition, the guidelines recognize that although superiority data are lacking, some patients do experience a clinical response with desiccated thyroid preparations or combination therapy with l-thyroxine plus l-triiodothyronine (1). The European Thyroid Association has similar recommendations (2).
Two things to keep in mind: First, iron is tough for the body to absorb, but you can boost your absorption of iron-rich foods by pairing them with a source of vitamin C, Markley says. (Like tossing white beans with lemon vinaigrette, for instance.) And second, iron can make thyroid drugs less efficient. So be sure to take your thyroid meds at least four hours before or after eating an iron-rich meal .
Ashwagandha is an adaptogen herb that helps the body respond to stress, keeping hormone levels better in balance. Adaptogens helps lower cortisol and balance T4 levels. In fact, in clinical trials, supplementing with ashwagandha for eight weeks essentially worked as thyroxine treatment, helping hypothyroidism patients significantly increase thyroxine hormone levels and thus reduce the severity of the disorder. (13) Also, try other adaptogen herbs like rhodiola, licorice root, ginseng and holy basil, which have similar benefits.
You may have read that green, leafy veggies like kale, bok choy, broccoli, and Brussels sprouts can make hypothyroidism worse. But before you keep reading, ask yourself a question: Do you live in the United States? That’s key — because if you do, you likely don’t need to worry about these cancer-fighting veggies messing with your hypothyroidism management. (7)
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