Cardiology

Thyroid disease significantly affects cardiovascular health due to the thyroid hormones ' influence on heart rate, blood pressure, and vascular resistance. Hyperthyroidism can lead to arrhythmias like atrial fibrillation, increased heart rate, and high cardiac output, while hypothyroidism may cause bradycardia, increased cholesterol levels, and diastolic hypertension. Both conditions can contribute to long-term cardiovascular complications if left untreated. Therefore, thyroid function should be carefully monitored in patients with cardiac symptoms or existing heart disease.