The thyroid is a small butterfly-shaped gland which controls your metabolism and is located in your throat. In a small percentage of people, their thyroid doesn’t produce enough hormones, leading to symptoms of hypothyroidism. These include weight gain, constipation, dry skin, and low energy. Factors associated with impaired thyroid metabolism are high stress, selenium deficiency, illness, impaired liver function, drug interactions, heavy metal toxicity, poor nutrition, and often autoimmune disease (Hashimoto's Thyroiditis). Naturopathic treatments for hypothyroidism include specific supplementation, investigating links with adrenal fatigue and immune function, and in some cases thyroid hormone replacement with natural thyroid hormones.

Overactive thyroid glands are called hyperthyroidism and is often due to an autoimmune condition called Grave's Disease. Symptoms of hyperthyroidism include weight loss, heart palpitations, nervousness, tremor, excess sweating, and diarrhea. Naturopathic treatment includes use of specific thyroid-suppressing herbs and replacing specific nutrients.