The penile arteries are narrower than the coronary arteries, so when the blood vessels start to fur up (atherosclerosis), erections can suffer before any chest symptoms appear. Studies suggest ED can precede a heart attack or stroke by several years, which makes it a useful early signal rather than just a bedroom problem.
The risk factors overlap almost entirely: smoking, high blood pressure, diabetes, high cholesterol, obesity, and inactivity damage both systems. Treating these can improve both erectile function and heart health.
If you develop ED, especially over age 40 or with risk factors, see a doctor for a cardiovascular check, including blood pressure, cholesterol, and blood sugar. Seek urgent care immediately for chest pain, breathlessness, or stroke symptoms such as face drooping, arm weakness, or slurred speech, by calling your local emergency number.