Insulin might raise blood pressure by revving up the body's 'fight or flight' system and making the kidneys hold onto more salt, which can increase pressure in the blood vessels.

Chronic elevation of insulin activates the sympathetic nervous system, leading to increased heart rate, cardiac output, and peripheral vasoconstriction, thereby raising blood pressure.

If your body has too much insulin for a long time, it can make your kidneys hold onto more salt, which increases your blood volume and raises your blood pressure—even if you're not eating too much salt.

When your body becomes resistant to insulin, it makes more insulin to compensate, and that extra insulin can make your kidneys hold onto too much salt, which over time can lead to high blood pressure.

People with mild high blood pressure don't get as big of a blood flow boost in their muscles when insulin kicks in, compared to people with normal blood pressure.

When there’s too much insulin in the body, it messes with a signal that usually tells the kidneys to let go of salt, so the kidneys hold onto more salt instead — which might raise blood pressure.