High insulin levels and insulin resistance are linked to high blood pressure in people, especially those who are overweight — but even some people at a healthy weight. This connection doesn’t show up in other types of high blood pressure, so it might be a key factor in the most common kind.

Having trouble with insulin in people who have diabetes or are overweight might play a role in getting high blood pressure — which often shows up with those conditions — but we're not sure if it's actually causing it.

Having too much insulin in your blood or your body not responding well to insulin might be linked to heart attacks and kidney problems, especially in people with long-term high blood pressure.

Some people and animals can have serious insulin problems without getting high blood pressure — even when they're obese — which means these insulin issues don't always cause high blood pressure.

Insulin might not actually raise your blood pressure after all — recent studies haven't been able to prove that having too much insulin in your blood leads to high blood pressure.

People with mild high blood pressure who aren't taking medicine don't process sugar as well in their muscles and body when insulin is high, which suggests their body is resisting insulin's effects.