Resources: Frequently Asked Questions

Endocrine

Q: What is the difference between Hypothyroidism and Hyperthyroidism?

A: Hypothyroidism is a condition in which the thyroid gland is under active and produces too little thyroid hormone. Too little thyroid hormone causes the body's metabolism to slow down. Symptoms of hypothyroidism usually develop slowly and can be fairly subtle at first. Often the individual seems depressed. The facial expression seems dull and their face looks puffy or swollen. There is often weight gain. The skin becomes coarse, dry and scaly while the hair becomes dry and sparse. The voice sounds hoarse, and hearing may be impaired. There is constipation, cold intolerance, generalized aches and pains, weakness, tiredness and sleepiness. Some people appear confused, forgetful or even demented. When very severe hypothyroidism can cause anemia, low body temperature, heart failure, and life threatening myxedema coma.

In hyperthyroidism the thyroid gland is overactive and produces too much thyroid hormone. Too much thyroid hormone speeds up metabolism and the symptoms can be dramatic. The heart pounds rapidly and may develop an irregular beat (arrhythmia.) Blood pressure goes up. The individual looses weight despite an increased appetite. There is usually heat intolerance and excess sweating, diarrhea, sleep disturbance, and muscle weakness. Many individuals feel nervous, tremulous (shaky) and emotionally labile.