Erectile Dysfunction: Causes, Risk Factors & Treatment Options

Erectile dysfunction is persistent difficulty getting or keeping an erection firm enough for sex. It has physical causes (mostly blood flow, nerves and hormones) and psychological causes (stress, anxiety, depression, relationship strain), and the two often overlap. New ED can be an early warning sign of heart disease or diabetes, so it deserves a medical look. Treatment depends on the cause: lifestyle change and treating the underlying condition come first, counseling helps when emotions are involved, and FDA-approved PDE5 inhibitor pills are the standard first-line medicine. Those pills require a licensed provider.

Arousal triggers nerves to release nitric oxide in the penis. That produces cGMP, which relaxes the smooth muscle in the penile arteries. Blood rushes in, the spongy tissue fills and compresses the veins so blood stays put. The erection lasts until arousal ends and the enzyme PDE5 breaks cGMP down.

That chain needs four systems at once: healthy blood vessels, intact nerves, adequate hormones, and a mental state that allows arousal. ED happens when any link is weak. It is also why PDE5 inhibitor pills work only with arousal: they slow cGMP breakdown but cannot create the signal.

Clinicians usually sort ED by where the chain breaks:

• Vascular (vasculogenic): narrowed or stiff arteries, or blood that leaks out through the veins. The most common type in middle-aged and older men.
• Neurogenic: nerve damage from diabetes, multiple sclerosis, spinal cord injury, stroke or pelvic surgery, such as prostate surgery.
• Hormonal: low testosterone or thyroid imbalance, often with low desire as well.
• Drug-induced: a side effect of a medicine, alcohol or recreational drugs.
• Psychogenic: stress, anxiety, depression or relationship issues blocking arousal.
• Mixed: the most common real-world pattern, for example vascular ED made worse by performance anxiety.

Knowing the type matters because it changes the treatment and the urgency.

Most persistent ED is physical, and most of that is vascular. Atherosclerosis, the plaque that clogs heart arteries, also narrows the smaller penile arteries, often earlier. The NIH's National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK) lists the most common diseases and conditions that lead to ED:

• Diabetes
• Heart and blood vessel disease, including atherosclerosis, high blood pressure and stroke
• Chronic conditions such as chronic kidney disease, obesity and COPD
• Hormone issues such as low testosterone and thyroid imbalance
• Nerve damage or disorders such as multiple sclerosis, spinal cord injury and damage from pelvic surgery
• Male reproductive problems such as an enlarged prostate and Peyronie's disease (penile curvature)

Many everyday medicines list ED as a side effect. NIDDK names antidepressants, appetite suppressants, antihistamines and heartburn medicines, blood pressure medicines and diuretics, chemotherapy and hormone medicines, some pain relievers (including NSAIDs, codeine and oxycodone), sedatives and ulcer medicines.

If ED began after starting or changing a medicine, tell the prescriber. There may be an alternative. Never stop a prescribed medicine on your own, especially for blood pressure, depression or heart disease; the risks of stopping are usually bigger than the side effect. Our ED meds and blood pressure guide covers the blood-pressure side in detail.

The brain is where arousal starts, so mental and emotional factors can cause ED or make a physical cause worse. NIDDK lists anxiety, depression and stress, feeling isolated or lonely, and low self-esteem, lack of confidence or negative body image. Performance anxiety is a classic loop: one bad night creates worry, and the worry causes the next one. Depression runs both ways, causing ED and being deepened by it.

A clue clinicians use: men whose ED is mainly psychological often still have normal morning or nighttime erections, which suggests the physical machinery works. When emotions are a big factor, counseling, sex therapy or treating a mood disorder can matter as much as any pill, and the two are often combined.

NIDDK lists four lifestyle behaviors that contribute to ED: not getting enough physical activity, drinking too much alcohol, smoking and using recreational or illicit drugs. Smoking damages the blood vessels erections rely on; heavy drinking dulls both nerves and arousal; inactivity and excess weight drive the vascular and metabolic problems above. Poor sleep and untreated sleep apnea are also linked to low testosterone and ED.

The upside is that these are the risk factors you control. They are covered under treatment option 1 below.

This is the main reason not to ignore ED. Because the penile arteries are narrower than the coronary arteries, vascular ED can appear before any chest symptoms. Studies have reported ED preceding major cardiac events by years, which is why some cardiologists call it a potential sentinel sign of cardiovascular disease.

The takeaway is to investigate, not panic. New ED, especially with high blood pressure, high cholesterol, diabetes, smoking or a family history of heart disease, is a sensible prompt to have your heart and metabolic health checked. If you ever have chest pain or shortness of breath, seek care promptly.

Diabetes is one of the strongest risk factors for ED, because high blood sugar damages both small blood vessels and nerves. That is why ED in men with diabetes often starts earlier and can be harder to treat. Good control of blood sugar, blood pressure and cholesterol protects those vessels and nerves, and for some men improves erections. Our ED treatment for diabetes guide goes deeper.

For most men, diagnosis is a conversation, an exam and a few routine tests, not a battery of scans. A clinician typically covers:

• Medical and sexual history: when it started, whether it is sudden or gradual, whether morning erections still happen, desire, ejaculation, relationship context, and every medicine and substance you use.
• A short questionnaire, such as the IIEF or its five-question version (SHIM), to gauge severity and track progress.
• Physical exam: blood pressure, pulses, the genitals and signs of hormone problems.
• Lab tests: blood sugar or A1c, a cholesterol panel, and often a morning total testosterone level. Thyroid and kidney tests may be added.
• Specialist tests when needed: a penile Doppler ultrasound to look at blood flow, or overnight erection testing, usually only when the cause is unclear or surgery is being considered.

Telehealth visits handle the history and questionnaire well and can order lab work; a physical exam may still be recommended.

Low testosterone is a real but less common cause of ED, and it usually shows up with low desire too. The American Urological Association's testosterone guideline uses a total testosterone below 300 ng/dL, measured on two separate early-morning blood draws, together with symptoms, to define testosterone deficiency.

That has two practical consequences. Testosterone therapy is not a general ED treatment and only makes sense when low levels are confirmed. And at-home saliva tests, such as Everlywell's hormone kit (card above), are screening tools; bring the result to a clinician for proper blood testing rather than acting on it alone.

Gradually worsening ED usually means an underlying cause is progressing. Common reasons: artery disease advancing, blood sugar or blood pressure drifting out of control, weight gain, a new medicine, rising stress or depression, or falling testosterone with age. Performance anxiety can also compound a mild physical problem.

Worsening ED is a reason to book an evaluation rather than raise a pill dose on your own. A sudden change, or ED with chest discomfort, leg pain when walking or unusual fatigue, deserves prompt attention.

Often yes. Desire, orgasm and ejaculation are controlled by partly separate systems from erection, so many men with ED can still feel arousal and reach orgasm without a full erection. ED does not mean the end of a satisfying sex life, and talking about it with a partner removes much of the pressure that makes it worse. If orgasm or ejaculation has also changed, mention it; it can point to a nerve, hormone or medicine cause.

No drink or supplement is an FDA-approved ED treatment. Some foods and habits support vascular health in general, and that helps erections over time. But "natural" sexual enhancement products sold online and in convenience stores are a known risk: the FDA has repeatedly found products marketed as herbal or natural that contain hidden prescription drug ingredients, including sildenafil and tadalafil, at unknown doses. That is dangerous for men on nitrates, the very group most likely to be told to avoid ED pills.

Exercise, weight loss, quitting smoking and drinking less are the natural treatments with the best support. For anything in a bottle, ask a pharmacist first.

See a clinician when ED is persistent over weeks, or when it affects your mood, confidence or relationship. Go sooner if:

• You have diabetes, heart disease, high blood pressure or other cardiovascular risk factors
• It came on suddenly, or with chest discomfort, leg pain when walking or unusual fatigue
• You suspect a medicine, hormone problem, depression or anxiety
• You want treatment, since the safe options are prescription-based

A visit can be in person or through licensed telehealth. Either way, it is how serious causes get ruled out and how any medication is made safe for you.

Because most ED is vascular, what protects your arteries also supports erections. Regular physical activity, a healthy weight, quitting smoking, less alcohol, better sleep and a heart-healthy diet are the core levers. They are not a guaranteed fix and do not replace evaluating a serious cause, but they are low-risk, have no drug interactions, make other treatments work better, and you can start them today.

When evaluation finds a driver, treating it is often the best long-term move. That can mean controlling blood pressure, blood sugar or cholesterol, adjusting a medicine with your prescriber, or treating confirmed low testosterone. When anxiety, depression or relationship strain is the main factor, counseling or sex therapy is the matching treatment. You can only treat a cause you have identified, which is why the evaluation matters more than guessing at a pill.

For most men, first-line medicine is a PDE5 inhibitor. Four are FDA-approved for ED: sildenafil (Viagra), tadalafil (Cialis), vardenafil (Levitra) and avanafil (Stendra). They work the same way and all require sexual stimulation. They differ mainly in timing: sildenafil is usually taken about an hour before sex, while tadalafil can last up to 36 hours and has a daily low-dose option. Sildenafil, tadalafil and vardenafil come as lower-cost FDA-approved generics.

The key safety fact: PDE5 inhibitors must not be taken with nitrates, nitrite poppers or riociguat, because the combination can cause a dangerous drop in blood pressure. Compare the two main options in sildenafil vs tadalafil, and see sildenafil side effects for what to expect. Some telehealth brands sell compounded versions; compounded medications are not FDA-approved.

If pills do not work or are not safe for you, ED is still treatable. Vacuum erection devices use suction and a tension ring, with no drug involved. Injectable medicines and urethral suppositories deliver medicine locally and can work when pills do not. A penile implant is a surgical option for ED that does not respond to other treatments. Each has its own learning curve, and several need a procedure or hands-on teaching. For what each costs, see the ED treatment cost guide.

Whatever the treatment, the safe route runs through a licensed clinician: a primary care doctor, a urologist or a legitimate telehealth service. The provider reviews your symptoms, history and medicines, screens for serious causes and decides what, if anything, to prescribe.

Never buy prescription ED medicine from grey-market sellers, overseas pill sites or "research chemical" shops. Those products can be counterfeit or contaminated, and they skip the check that prevents dangerous interactions. For what legitimate online access looks like, see how to get ED meds online and is buying ED meds online safe.

Educational, not medical advice. For adults 18 and older. ED Samples does not sell, ship or prescribe medication.

• Causes, medicines, mental health and lifestyle factors: NIDDK, Symptoms and Causes of Erectile Dysfunction (checked 2026-10-30)
• Evaluation and treatment ladder: American Urological Association, Erectile Dysfunction Guideline; testosterone deficiency definition: AUA, Testosterone Deficiency Guideline
• Prevalence: Feldman HA et al., Impotence and its medical and psychosocial correlates: results of the Massachusetts Male Aging Study, Journal of Urology, 1994
• PDE5 inhibitor timing and nitrate contraindication: Viagra label and Cialis label on DailyMed
• Hidden drug ingredients in sexual enhancement products: FDA, Tainted Sexual Enhancement Products
• Everlywell Men's Health Hormone Test biomarkers, sample type and price: everlywell.com (checked 2026-10-30); Timm Medical prices: timmmedical.com (checked 2026-10-30)