Erectile Dysfunction (ED) is a common sexual health issue affecting men, characterized by the consistent inability to achieve or maintain an erection firm enough for sexual intercourse. While ED can occur at any age, its prevalence increases with age and can significantly impact quality of life, self-esteem, and intimate relationships. The causes of ED are multifactorial and can be divided into physical, psychological, and environmental factors. Physical causes include cardiovascular disease, diabetes, hormonal imbalances (including low testosterone levels), neurological disorders, and certain medications. Psychological causes encompass stress, anxiety, and depression. Lifestyle and environmental factors such as smoking, alcohol use, and obesity also contribute to the risk of developing ED. Testosterone plays a pivotal role in sexual function, and low levels of this hormone (a condition known as hypogonadism) have been directly linked to the development of ED. Testosterone is essential for libido (sexual desire) and is involved in the mechanisms leading to an erection. Testosterone Replacement Therapy (TRT) can be an effective treatment for men whose ED is primarily due to low testosterone levels. However, TRT is only one component of a comprehensive treatment plan, which may also include lifestyle changes, psychological support, and other medical treatments aimed at underlying causes of ED. It is important for men experiencing ED to seek medical evaluation to determine the underlying cause and appropriate treatment.