9. High Blood Pressure
Thyroid disorders have also been associated with elevated blood pressure. Patients with both hypothyroidism and hyperthyroidism are vulnerable to the condition. When thyroid hormone production is inadequate, the heart rate is slowed, which impacts the body’s ability to pump blood and also reduces the flexibility of blood vessel walls. Together, these may cause a spike in blood pressure. With hyperthyroidism, the blood pumping mechanism is sped up, which may not just increase blood pressure, but also the heart rate, causing heart palpitations and excessive sweating in severe cases.