الفهرس 
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Abstract
Erectile dysfunction is the inability to obtain or maintain the erection for satisfactory sexual performance. ED is a multifactorial disease. One of the causes of ED can be low testosterone levels or late onset hypogonadism.
Testosterone controls directly or indirectly on penile erection function. The clinical symptoms most commonly associated with late onset hypogonadism are low libido, erectile dysfunction, decreased vigor and muscle mass and strength, increased body fat, decreased bone mineral density and osteoporosis, decreased vitality, depressed mood and fatigue.
The aim of this study was to assess the prevalence late onset hypogonadism among patients with erectile dysfunction.
This study was cross-sectional study including 70 male patients older than 40 years diagnosed with erectile dysfunction (ED) attending to Dermatology and Andrology Department, Suez Canal University Hospital in Ismailia.