Erectile dysfunction (ED) can be an early indicator of coronary artery disease (CAD) as both share similar risk factors like high blood pressure, high cholesterol, diabetes, obesity, and smoking. ED occurs when CAD disrupts blood flow not only to the heart but also to the penis. Lifestyle changes like exercising regularly, following a healthy diet, losing weight, quitting smoking, and limiting alcohol can help treat ED caused by CAD. Medications like PDE5 inhibitors and supplements have also shown effectiveness for this condition.