What Causes Erectile Dysfunction?

What it looks like

Before getting into causes, it helps to know what actually counts as ED. The three most common signs are struggling to get an erection when you want one, struggling to hold onto it once you have it, and a drop in your general interest in sex.

Any one of these happening occasionally is not necessarily cause for concern. It is when they keep happening that it is worth paying attention, because that is usually a sign there is an underlying cause worth identifying.

Physical causes

The most common physical causes come down to blood flow and hormones. High blood pressure and high cholesterol can affect blood flow to the penis in the same way they affect blood flow everywhere else in the body, which is also why ED can sometimes be an early warning sign of heart problems worth getting checked.

Diabetes works in a similar way, affecting both blood vessels and nerves over time. Low testosterone and other hormonal issues can reduce both desire and physical response, which is often what is behind a drop in sex drive alongside the physical symptoms.

Some medications, including certain blood pressure drugs and antidepressants, can also list ED as a side effect. That is worth raising with whoever prescribed them rather than just living with it.

Psychological causes

Stress, anxiety and depression can all get in the way of the mind-body connection an erection depends on. Performance anxiety in particular can create a cycle where worrying about it becomes part of the problem.

This is just as real and just as treatable as a physical cause, even though it does not show up on a blood test.

Lifestyle factors

Smoking, drinking more than the recommended amount, and general fitness levels all play a supporting role too, mostly because they overlap with the same blood flow and cardiovascular factors mentioned above.

That does not mean lifestyle is the only answer, or that ED is your fault. It means the wider health picture can matter, especially if symptoms are persistent.

Matching the cause to the fix

This is the part that often gets skipped. The cause you're dealing with should shape which treatment makes sense.

• If the cause is vascular, such as blood pressure, cholesterol or diabetes, first-line ED treatments often work by increasing blood flow. Health Compare lets you compare sildenafil, tadalafil, Viagra and Viagra Connect side by side.
• If you would rather not plan around taking something before sex, daily tadalafil may be a useful comparison route to discuss with a clinician.
• If it is psychological, therapy, counselling or a structured support programme addresses the root issue rather than just the symptom. Medication can still help in the meantime, but it will not fix the underlying cause on its own.
• If it is hormonal, it is worth actually getting tested rather than guessing, because treating low testosterone is a different path from ED medication. Start with the low testosterone comparison or a testosterone blood test.
• If it is a medication side effect, the fix is often a conversation with your GP about alternatives, not an ED treatment at all.

When to get it checked

If erection problems keep happening rather than being a one-off, it is worth talking to a GP or a sexual health clinic. Persistent ED can sometimes be an early flag for other health conditions, cardiovascular issues especially, so getting it checked is not just about the ED itself.