There is a connection between hypothyroidism and high blood pressure that most thyroid patients aren't aware of. Your thyroid helps to regulate the elasticity of your arteries by impacting the smooth muscle found in these vessels. When you are in a hypothyroid state your arteries become less elastic. As a result, blood pressure will increase because fluid is moving through a more rigid blood vessel. You can think of water running through a hose versus putting water in something elastic like a wa