The signs of erectile dysfunction (ED) are straightforward: difficulty getting an erection, difficulty keeping one, or a noticeable drop in sexual desire. These are the core symptoms, and when they persist for three months or more, they cross the line from an occasional off night into a pattern worth taking seriously. More than 30% of men between 40 and 70 experience ED, so while it’s common, it’s also worth understanding because the signs can point to larger health issues hiding beneath the surface.
The Three Core Symptoms
ED shows up in one or more of three ways. The first is trouble getting an erection at all. The second is getting one but losing it before or during sex. The third is a reduced desire for sex in the first place. These symptoms tend to be ongoing and often get worse over time rather than resolving on their own.
Having trouble once in a while is normal. Stress, poor sleep, alcohol, or just being distracted can interfere on any given night. The clinical threshold is consistent difficulty lasting longer than three months. If erection problems happen regularly over that window, something beyond a bad day is likely involved.
How Erections Work (and Where They Break Down)
An erection starts when arousal triggers nerve endings in the penis to release a chemical signal that relaxes blood vessel walls, allowing them to widen and fill with blood. Once blood starts flowing in, the pressure against the vessel walls triggers the vessels themselves to release more of that same signal, creating a feedback loop that sustains the erection. If any part of that chain is disrupted, whether it’s the nerve signaling, the blood vessel health, or the hormonal drive behind arousal, the result is ED.
This is why ED is so closely tied to cardiovascular health. The blood vessels in the penis are smaller than those feeding the heart, so damage from high cholesterol, high blood sugar, or high blood pressure tends to show up there first. In fact, ED typically appears three to five years before a heart attack or stroke in men with underlying artery disease. That makes it one of the earliest detectable warning signs of cardiovascular problems, and one of the most important reasons not to dismiss it.
Physical ED vs. Psychological ED
Not all ED has the same cause, and the pattern of your symptoms offers real clues about what’s going on.
Physical (organic) ED tends to come on gradually. Over months or years, erections become less firm or harder to maintain. Libido often stays normal, and ejaculation still works fine. Risk factors include diabetes, heart disease, obesity, high cholesterol, smoking, heavy alcohol use, and certain medications. If you’ve had surgery or radiation in the pelvic area, that can contribute too.
Psychological ED looks different. It tends to start suddenly, often tied to a stressful life event, relationship conflict, anxiety, or depression. A key hallmark: you can still get erections in other contexts. Spontaneous erections, erections from self-stimulation, and morning erections all still happen, because the physical machinery is intact. Psychological ED may also show up alongside premature ejaculation or an inability to ejaculate at all.
What Morning Erections Tell You
Morning erections happen during sleep as a normal physiological process in healthy men. They occur during REM sleep cycles and have nothing to do with sexual thoughts or dreams. Because they’re involuntary, they serve as a useful litmus test for whether your body’s erection hardware is functioning properly.
If you regularly wake up with erections, it strongly suggests your blood vessels, nerves, and hormones are working well enough to produce one. That points toward psychological or situational factors as the more likely cause of any difficulties during sex. If morning erections have disappeared or become noticeably weaker, that’s a sign the issue may be physical, involving blood flow, nerve function, or hormone levels.
Signs That Hormones Are Involved
Low testosterone doesn’t always cause ED directly, but it creates conditions that make it much more likely. The most telling sign is a drop in sex drive. You may simply stop thinking about sex as often, or find that the desire just isn’t there even when the opportunity is. This is different from wanting sex but not being able to perform, which points more toward a vascular or nerve issue.
Other signs that hormones may be playing a role include persistent fatigue that keeps you from wanting to exercise or be active, unexplained weight gain (especially around the midsection), and mood changes like increased irritability or low motivation. These symptoms tend to cluster together. The fatigue leads to less activity, which leads to weight gain, which increases ED risk on its own. Excess weight is strongly associated with ED, with some research showing an eightfold increase in risk among men who are significantly overweight.
Medications That Can Cause ED
If your erection problems started around the same time you began a new medication, the timing may not be a coincidence. Several common drug classes list ED as a side effect.
- Blood pressure medications: Water pills (thiazide diuretics) are the most common culprits among blood pressure drugs, followed by beta blockers. Alpha blockers are less likely to cause problems.
- Antidepressants and anti-anxiety medications: Many commonly prescribed antidepressants can affect sexual function, including SSRIs and older tricyclic antidepressants. Anti-anxiety medications in the benzodiazepine family can also contribute.
- Antihistamines: Both allergy medications and certain heartburn drugs (H2 blockers) can interfere with erections.
- Hair loss and prostate medications: Drugs prescribed for male-pattern baldness or enlarged prostate that work by blocking certain hormones are known to affect sexual function in some men.
- Chemotherapy and hormone-blocking drugs: Cancer treatments that suppress testosterone or damage blood vessels can cause ED as a side effect.
Never stop a prescribed medication on your own because of sexual side effects. But knowing that the link exists gives you something concrete to discuss with your doctor, who may be able to adjust the dose or switch to an alternative.
Risk Factors That Raise Your Odds
Diabetes is one of the strongest predictors. Men with diabetes are roughly three times more likely to develop ED than men without it, and they tend to experience it 10 to 15 years earlier. If diabetes has been present for more than five years, the risk triples again. Poor blood sugar control makes things significantly worse: men with poorly managed blood sugar have about five times the risk compared to those keeping it under control.
High cholesterol is another major factor. Elevated total cholesterol and LDL (“bad” cholesterol) are each associated with roughly a fivefold increase in ED risk, because cholesterol buildup directly damages the blood vessel lining that erections depend on. Obesity independently raises risk as well, through a combination of hormonal disruption, inflammation, and vascular damage. Heavy alcohol consumption is also strongly linked to ED.
ED as a Cardiovascular Warning Sign
This is the part many men don’t expect. Because the arteries supplying the penis are significantly narrower than coronary arteries, the same plaque buildup that eventually causes heart attacks shows up in erectile function first. ED typically precedes a cardiovascular event by three to five years. That gap is actually good news: it means there’s a meaningful window to identify and treat the underlying artery disease before it progresses to something dangerous.
For men in their 40s and 50s who develop ED without an obvious psychological trigger, a cardiovascular workup is one of the most valuable next steps. The erection problem itself is treatable, but more importantly, catching the vascular disease behind it early can be lifesaving.