Erectile Dysfunction: Common Causes, Recommended Tests and Treatment Options

Erectile dysfunction, or ED, is a persistent difficulty getting or keeping an erection that is firm enough for satisfactory sexual activity. It is common, but it should not be dismissed as an inevitable part of ageing.

Most cases have more than one contributor. A careful assessment can identify treatable health risks, reduce anxiety and help select an option that is safe for the individual.

What commonly causes erectile dysfunction?

Blood-vessel and metabolic causes

An erection depends on healthy blood flow. High blood pressure, abnormal cholesterol, diabetes, smoking, obesity, inactivity and established cardiovascular disease can affect the penile arteries and erection quality.

Hormonal causes

Confirmed testosterone deficiency can reduce sexual desire and contribute to erection difficulties. Thyroid disease and raised prolactin are less common but relevant in selected men. Testosterone should not be presumed to be the cause without symptoms and properly timed blood tests.

Nerve or structural causes

Neurological disease, pelvic surgery, prostate treatment, spinal injury, penile curvature and previous trauma may affect nerves, blood flow or anatomy.

Medication and substance causes

Some antidepressants, blood-pressure treatments, opioids, hormonal medicines and other drugs can contribute. Alcohol and recreational drugs may also affect erections.

Do not stop a prescribed medicine abruptly. A clinician can consider whether the timing or choice could be reviewed safely.

Psychological and relationship factors

Stress, anxiety, depression, low confidence, previous sexual difficulty, relationship strain and performance worry can all interrupt arousal. This does not make the problem imaginary. Physical and psychological factors often reinforce each other.

What does the pattern tell us?

The clinician may ask whether the problem was sudden or gradual, happens in every situation, and whether morning, spontaneous or masturbation erections remain.

A situational or sudden problem with preserved spontaneous erections can suggest a strong psychological component, while a gradual and consistent change may suggest a physical driver. These are clues, not rules. Preserved morning erections do not rule out physical disease.

Which health checks are recommended?

A core assessment commonly includes:

• a detailed medical and sexual history;
• blood pressure and pulse;
• weight, BMI or waist measurement;
• cardiovascular risk and smoking history;
• genital, hormonal, vascular or neurological examination when indicated;
• HbA1c or fasting glucose;
• a lipid profile; and
• fasting early-morning total testosterone.

SHBG, calculated free testosterone, prolactin, LH, thyroid tests or PSA may be useful in selected cases. Specialised penile blood-flow tests are not needed for most men at the first assessment.

Can ED be an early sign of another condition?

Yes. ED may be the first recognised sign of diabetes, high blood pressure, abnormal cholesterol or vascular disease. It can appear before obvious cardiovascular symptoms in some men because the penile arteries are small.

This does not mean every man with ED has heart disease. It means the appointment should include cardiovascular risk assessment rather than focusing only on sexual performance.

How is erectile dysfunction treated?

Address contributing health factors

Regular activity, weight reduction where appropriate, stopping smoking, moderating alcohol and improving sleep can improve erections and long-term health. Diabetes, blood pressure and cholesterol risk should be managed.

Review medication

If a prescribed medicine might contribute, the clinician can weigh its benefit against alternatives. Never change it without the prescriber’s advice.

Psychological or psychosexual therapy

Individual or couples-based therapy can help with anxiety, confidence, communication, relationship strain and unhelpful patterns that maintain the problem. It can be used alone or alongside medical options.

Oral medicines

Oral prescription medicines that support penile blood flow are generally a first-line medical option when appropriate. They still require sexual stimulation and can fail if timing, food, dose or instructions are not right.

They must not be used with nitrate medicines, nicorandil or recreational nitrites such as “poppers”, because the combination can cause a dangerous fall in blood pressure. Cardiovascular status and other medication must be reviewed before prescribing.

Vacuum erection devices

A vacuum device draws blood into the penis and a constriction ring helps retain it. It avoids systemic drug effects and can be useful when tablets are unsuitable, but correct sizing and instructions matter.

Specialist options

Self-injection treatment, urethral treatment, penile surgery or specialist vascular and psychological assessment may be considered when first-line approaches are unsuitable or unsuccessful. These require detailed counselling and, in many cases, specialist care.

What if the first treatment does not work?

Failure does not automatically mean the condition is untreatable. The clinician should check:

• whether the medicine or device was used correctly;
• timing, meals and adequate sexual stimulation;
• whether enough separate attempts were made;
• whether the product came from a regulated source;
• whether diabetes or cardiovascular risk is poorly controlled;
• whether low desire, pain, curvature or relationship factors were overlooked; and
• whether referral or a different approach is appropriate.