Thyroid and High Blood Pressure

Is there are link between high blood pressure and having an underactive thryoid?

[GravesLady]

Some conditions that can cause secondary hypertension, high blood pressure include:

Sleep apnea
Preeclampsia
Pheochromocytoma (a tumor of the adrenal gland)
Cushing's syndrome (a hormonal disorder)
Aldosteronism (a condition in which adrenal glands produce too much of the hormone aldosterone)
Hypothyroidism (the thyroid doesn't produce enough hormones)
Hyperthyroidism (the thyroid produces an excess of hormones)
Coarctation of the aorta (narrowing of the aorta)
Hyperparathyroidism (excessive production of parathyroid hormone by the parathyroid glands)
Acromegaly (a metabolic disorder caused by too much growth hormone)
Certain medicines, such as birth control pills
Kidney disease (such as polycystic kidney disease or