Erectile dysfunction (ED) is the persistent inability to get or maintain an erection firm enough for sex. It affects roughly 8% of men in their 40s, climbing to about 44% of men in their 60s and over 60% of men in their 70s. While occasional difficulty with erections is normal and not cause for concern, a consistent pattern lasting several weeks or more points to something worth investigating, both for sexual health and for what it may reveal about your body overall.
How an Erection Works
An erection is fundamentally a blood flow event. When the brain registers arousal, it sends signals through the spinal cord and into nerves that run alongside the penis. Those nerve endings release nitric oxide, a chemical messenger that tells the smooth muscle inside the penis to relax. As the muscle relaxes, arteries widen and blood rushes in, filling two sponge-like chambers called the corpora cavernosa. The expanding chambers compress the veins that would normally drain blood away, trapping it inside. The result is a rigid erection with very little blood flowing in or out.
The erection ends when an enzyme breaks down the chemical signal keeping the muscle relaxed. The smooth muscle contracts, the arteries narrow, the veins reopen, and blood drains back into the body. ED can develop when anything in this chain goes wrong: the nerve signals, the blood vessels, the smooth muscle, or the chemical messengers that coordinate the whole process.
Common Physical Causes
Most cases of ED have a physical root, and the most common one is vascular disease. Conditions that damage blood vessels, including high blood pressure, high cholesterol, and atherosclerosis (plaque buildup in arteries), reduce the flow of blood the penis needs. Because penile arteries are smaller than coronary arteries, they tend to show damage earlier. On average, ED appears about three years before a first cardiovascular event like a heart attack or stroke. That makes ED a potential early warning sign of broader circulatory problems, not just a bedroom issue.
Diabetes is another leading cause. Over time, elevated blood sugar damages both the small blood vessels and the nerves that trigger erections. Neurological conditions like multiple sclerosis or spinal cord injuries can also interrupt the signals between the brain and the penis. Hormonal factors play a role too, particularly low testosterone, though this is a less common sole cause than many people assume.
Certain medications are frequent culprits. Antidepressants (especially SSRIs), blood pressure drugs, and some cancer treatments can interfere with erections as a side effect. If ED started around the same time as a new prescription, that connection is worth discussing with your prescriber.
Psychological and Lifestyle Factors
Stress, anxiety, depression, and relationship conflict can all trigger or worsen ED, particularly in younger men. Performance anxiety creates a cycle: one episode of difficulty leads to worry, which makes the next episode more likely. In many cases, psychological factors overlap with physical ones. A man with mild vascular changes might function fine until stress tips the balance.
Smoking directly damages blood vessel linings and accelerates the vascular problems behind ED. Research shows that ED status improved in at least 25% of men who quit smoking within one year. Obesity contributes through multiple pathways, including reduced testosterone, increased inflammation, and insulin resistance. Losing just 10% of body weight has been shown to improve erection quality, boost testosterone levels, and increase sexual desire in both diabetic and non-diabetic men.
How ED Is Assessed
Doctors typically start with a medical history and a short questionnaire. The most widely used screening tool is a five-question survey that asks about confidence in getting an erection, firmness during intercourse, ability to maintain an erection, difficulty completing intercourse, and overall satisfaction. Scores range from 5 to 25. A score of 22 to 25 is considered normal, 17 to 21 indicates mild ED, 12 to 16 is mild to moderate, 8 to 11 is moderate, and 5 to 7 is severe.
Blood work often follows to check for diabetes, cholesterol problems, hormonal imbalances, and other underlying conditions. In some cases, a doctor may order an ultrasound to directly measure blood flow in the penis. The goal isn’t just to confirm ED but to identify what’s driving it, because treating the root cause often improves erections on its own.
Treatment Options
The American Urological Association recommends a shared decision-making approach, meaning there’s no rigid ladder you have to climb from least to most invasive. You and your doctor should discuss all available options and choose what fits your situation, preferences, and health profile.
That said, most men start with oral medications. These drugs work by blocking the enzyme that breaks down the chemical signal responsible for keeping penile smooth muscle relaxed. This allows blood to flow in more easily and stay longer. One common option is taken 30 minutes before sex at a starting dose of 10 mg, while a daily low-dose version (2.5 mg) keeps the drug active around the clock so timing isn’t a factor. The most common side effects are mild: heartburn, indigestion, headache, and occasional dizziness. These medications don’t create arousal on their own. You still need mental or physical stimulation for them to work.
If oral medications aren’t effective or can’t be used (they’re unsafe to combine with certain heart medications), other options include vacuum erection devices, injections directly into the penis, urethral suppositories, and surgical implants. Each has trade-offs in terms of spontaneity, effectiveness, and side effects, but all are considered valid first-line choices depending on the individual.
Lifestyle Changes That Make a Difference
For many men, particularly those with mild to moderate ED, lifestyle changes produce meaningful improvement. A meta-analysis found that moderate physical activity reduced the odds of ED by 37%, while high activity levels cut the risk by 58%. The standard recommendation is 150 minutes per week of aerobic exercise, which has been shown to improve erection scores after just three months.
Diet matters too. A two-year study of men with metabolic syndrome and ED found that those following a Mediterranean diet, rich in fruits, vegetables, nuts, whole grains, and olive oil, had significantly better erection scores than a control group. Interestingly, moderate alcohol consumption (roughly 1 to 20 drinks per week) is associated with 25% to 30% lower odds of ED compared to not drinking at all, though heavy drinking has the opposite effect.
These changes work because they address the vascular and metabolic problems underneath ED. Improved blood vessel health, better blood sugar control, lower inflammation, and higher testosterone all follow from weight loss, exercise, and better nutrition. For men whose ED is an early signal of cardiovascular risk, these same changes protect the heart as well.
ED as a Signal Worth Taking Seriously
Because the penile arteries are among the smallest in the body, they’re often the first to show the effects of vascular damage. The three-year average gap between ED onset and a first cardiovascular event makes erectile dysfunction one of the most reliable early indicators of heart disease in men. For men under 50 with no obvious risk factors, new ED can be the first sign that something is quietly developing in the cardiovascular system. Getting evaluated for ED can lead to catching high blood pressure, diabetes, or cholesterol problems years before they would have been found otherwise.