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Causes

Causes of or contributors to ED shall include: 

Prescription medications (e.g. SSRIs, beta blockers, agonists of adrenergic receptors alpha-2, thiazides, hormone modulators, and 5α-reductase inhibitors)

Neurogenic disorders (for example, diabetic neuropathy, temporal lobe epilepsy, multiple sclerosis , Parkinson 's disease, multiple system atrophy) 

Cavernosal (e.g. Peyronie 's disease) disorders 

Hyperprolactinemia (for example, with a prolactinoma) 

Psychological causes: anxiety over success, stress and mental disorders 

Surgery (for instance radical prostatectomy) 

Aging: In men aged 60s it is four times more common than in men of their 40s. 

Kidney insufficiency 

Lifestyle habits, particularly smoking, which is a key risk factor for ED as it causes narrowing of the arteries.

Surgical intervention may remove anatomical structures necessary to install, damage nerves or interrupt blood supply for a variety of conditions. ED is a common complication of prostate cancer treatments, including prostatectomy and prostate destruction by external beam radiation, though the prostate gland itself is not required for an erection. In most cases, as far as inguinal hernia surgery is concerned, even in the absence of postoperative complications, surgical repair can lead to a recovery of the sexual life of people with preoperative sexual dysfunction, although in most cases it does not affect people with preoperative normal sexual life.

Because of both neurological and vascular compression disorders, ED may also be linked to bicycling. The probability of the increase seems around 1.7-fold. 

Concerns that the use of pornography can trigger ED in epidemiological studies have little support, according to a literature review in 2015.

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Lexicology

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Pathophysiology

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