These 6 nutrient deficiencies can cause hypothyroidism or low thyroid symptoms. Not only can they cause low thyroid symptoms but patients who already have hypothyroidism are at an increased risk for developing them. Understanding these nutrients gives you the chance as a thyroid patient to potentially help support your thyroid gland in a natural way. These nutrients impact your thyroid in many ways including thyroid conversion, thyroid hormone production, and thyroid cellular sensitivity.