primary vs secondary hypothyroid symptoms
Symptoms of primary hypothyroidism are sometimes difficult to detect. The signs are associated with decreased metabolism, such as personality changes, forgetfulness, and weight gain, says Healthline. Other symptoms include sensitivity to cold, constipation, and tingling or burning sensations in the hands and feet.
Secondary hyperthyroidism is characterized by elevated levels of TSH, freeT4 and/or free T3 levels. If the free T4 level is normal but symptoms of hyperthyroidism are present along with a suppressed TSH, T3 toxicosis should be considered and a serum free T3 level should be determined if not ordered initially.