Erectile dysfunction (ED) is the consistent inability to get or maintain an erection firm enough for sexual intercourse. It affects roughly one in four men aged 45 to 54, one in three men aged 55 to 64, and nearly half of men aged 65 to 74. While it becomes more common with age, ED is not an inevitable part of aging, and it often signals treatable underlying health problems.
How Common ED Is by Age
ED is far more widespread than most people realize. Data from the 2021 National Survey of Sexual Wellbeing found that 25.3% of men aged 45 to 54 met diagnostic criteria for ED, rising to 33.9% among men 55 to 64 and 48% among men 65 to 74. Those numbers only count men who meet a clinical threshold, not the larger group who experience occasional difficulty.
Younger men are not immune. A study published in The Journal of Urology found that among sexually active young adult men, 11.3% reported mild ED and 2.9% reported moderate to severe ED. In younger men, the causes tend to be different. Mental health factors like anxiety, depression, and antidepressant use were strongly linked to ED in this group, while metabolic factors like high BMI, diabetes, and high cholesterol were not. Antidepressant use alone was associated with more than three times the odds of moderate to severe ED in young men. Being in a stable relationship appeared protective: married or partnered men had 65% lower odds of ED compared to single men.
What Causes Erectile Dysfunction
An erection depends on a precise sequence of events. The brain sends a signal through the nervous system, blood vessels in the penis relax and widen, blood flows in and fills two spongy chambers, and the swelling compresses the veins that normally drain blood out, keeping the erection firm. A problem at any point in that chain can cause ED.
Blood Vessel Damage
The most common physical cause is damaged blood vessels. Both ED and heart disease begin with damage to the inner lining of blood vessels, a layer that controls how much vessels relax and how freely blood flows. When that lining stops working properly, blood flow drops throughout the body, including to the penis. Over time, this damage leads to plaque buildup inside artery walls, further restricting flow. High blood pressure accelerates this process by wearing down the vessel lining faster.
Here’s the detail that makes ED medically important: the arteries supplying the penis are significantly smaller than those supplying the heart. That means reduced blood flow shows up in the penis years before it causes chest pain or other cardiac symptoms. For many men, ED is the earliest warning sign of cardiovascular disease. This is why doctors take new ED seriously, especially in men with risk factors like smoking, high cholesterol, diabetes, or high blood pressure.
Hormonal Factors
Low testosterone can contribute to ED, though its role is more nuanced than many men assume. The American Urological Association defines low testosterone as a total level below 300 ng/dL. Men with ED do tend to have lower testosterone than men without it, but the average difference between the two groups is only about 47 ng/dL. That means plenty of men with low testosterone have normal erections, and plenty of men with ED have normal testosterone. Still, testosterone plays a role in sex drive and the biological machinery behind erections, so testing is a standard part of any ED evaluation.
Psychological and Neurological Causes
Stress, anxiety, depression, and relationship conflict can all cause or worsen ED, particularly in younger men. Performance anxiety creates a cycle: one episode of difficulty triggers worry about the next one, which makes the next one more likely. Neurological conditions like multiple sclerosis, spinal cord injuries, and nerve damage from prostate surgery can also interrupt the signals that trigger erections.
How Severity Is Measured
Doctors typically use a five-question screening tool called the IIEF-5 to assess how severe ED is. You rate aspects of your sexual function over the previous four weeks, and the total score falls into one of five categories: no ED (22 to 25 points), mild (17 to 21), mild to moderate (12 to 16), moderate (8 to 11), or severe (1 to 7). This score helps guide treatment decisions and track whether a treatment is working.
Beyond the questionnaire, the initial workup usually includes a physical exam checking for signs of hormonal issues or penile abnormalities, along with blood tests for blood sugar, cholesterol, and an early-morning testosterone level. If oral medications don’t work, some men undergo a penile Doppler ultrasound, which uses sound waves to measure blood flow into and out of the penis in real time. This test can distinguish between ED caused by insufficient blood flowing in versus blood leaking out too quickly.
Treatment Options
The first-line treatment for most men is an oral medication that works by relaxing blood vessel walls in the penis, allowing more blood to flow in during arousal. These medications do not create an erection on their own. Sexual stimulation is still required. The two most commonly prescribed options differ mainly in how long they last. One works for about four to five hours, making it something you take before anticipated sexual activity. The other lasts 17 to 21 hours, giving a much wider window and the option of daily low-dose use for more spontaneous sex.
These medications work well for many men, but they’re less effective when the underlying blood vessel damage is severe or when nerve damage is the primary cause. Side effects can include headache, flushing, nasal congestion, and in some cases visual changes. They cannot be taken safely with certain heart medications, particularly nitrates used for chest pain.
When oral medications fail, other options include vacuum erection devices (a plastic cylinder that uses suction to draw blood into the penis), injectable medications delivered directly into the side of the penis before sex, and penile implants placed surgically. Each step up tends to be more invasive but also more reliably effective. Men with low testosterone who also have ED may benefit from testosterone therapy, though it often works best in combination with other treatments rather than on its own.
Lifestyle Changes That Help
Exercise is one of the most effective lifestyle interventions for ED. A meta-analysis of randomized controlled trials found that aerobic exercise, done for 30 to 60 minutes per session, three to five times per week, significantly improved erectile function. The benefits come from multiple angles: exercise improves blood vessel health, lowers blood pressure, reduces body fat, improves mood, and increases testosterone modestly.
Other changes that make a measurable difference include quitting smoking (which directly damages blood vessel lining), losing weight if you carry excess body fat (particularly around the abdomen), managing blood sugar if you have diabetes, and reducing alcohol intake. Sleep matters too. Testosterone production peaks during deep sleep, and untreated sleep apnea is independently linked to ED.
For younger men whose ED is rooted in anxiety or depression, therapy can be highly effective. Cognitive behavioral therapy helps break the cycle of performance anxiety, and couples therapy can address relationship dynamics that contribute to sexual difficulty. If antidepressants are part of the problem, switching to a different class of medication or adjusting the dose sometimes resolves ED without sacrificing mental health treatment.
Why ED Deserves Medical Attention
Many men avoid bringing up ED, treating it as embarrassing rather than medically significant. But because penile arteries are smaller than coronary arteries, ED can precede a heart attack or stroke by two to five years. A man in his 40s or 50s who develops ED with no obvious psychological cause has a genuine reason to get his cardiovascular health checked. Blood pressure, cholesterol, and blood sugar testing can catch problems early, when they’re most treatable. Treating ED isn’t just about sexual function. It’s often about catching the first sign that your blood vessels are in trouble.