Hypothyroidism is also associated with an increased risk of heart disease due to the high levels of low-density lipoprotein cholesterol in the system. This often occurs in people with an underactive thyroid. Even mild hypothyroidism can cause an increase in total cholesterol levels and impair the pumping ability of your heart. Hypothyroidism can also lead to an enlarged heart and heart failure. Once a person reaches advanced hypothyroidism, known as myxedema it can become life-threatening.
Myxedema although somewhat a rare yet life-threatening condition is the result of long-term, undiagnosed hypothyroidism. Its signs and symptoms include intense cold intolerance and drowsiness followed by profound lethargy and unconsciousness. A myxedema coma may be triggered by sedatives, infection or other stress on your