https://en.wikipedia.org/wiki/Erection
An erection (clinically: penile erection or penile tumescence) is a physiological phenomenon in which the penis becomes firm, engorged, and enlarged. Penile erection is the result of a complex interaction of psychological, neural, vascular, and endocrine factors, and is often associated with sexual arousal, sexual attraction or libido, although

https://www.webmd.com/erectile-dysfunction/how-an-erection-occurs
Erectile dysfunction. Also known as impotence, erectile dysfunction (ED) is the inability to have or maintain an erection adequate for sex. If you have a penis, you are bound to experience ED at

https://my.clevelandclinic.org/health/articles/10036-erection
An erection is when your penis becomes hard and enlarged from an increase in blood flow. This increase in blood flow makes your penis stand up and away from your body (erect). Sexual stimulation or excitement is the typical cause of an erection. But people can get random or spontaneous erections. Erections go away after you ejaculate, but can

https://en.wikipedia.org/wiki/Human_penis
An erection is the stiffening expansion and orthogonal reorientation of the penis, which occurs during sexual arousal. Erections can occur in non-sexual situations; spontaneous non-sexual erections frequently occur during adolescence and sleep. In its flaccid state, the penis is smaller, gives to pressure, and the glans is covered by the foreskin.

https://www.healthline.com/health/erectile-dysfunction/surprising-facts
Learn about the normal and abnormal aspects of erections, such as how many you have per night, how they can break, and how they can signal health problems. Find out how lifestyle choices, stress, and medications can affect your ability to get or keep an erection.

https://www.medicalnewstoday.com/articles/how-to-get-harder-erections
Learn about lifestyle changes, diet, exercise, therapy, and medication that can help improve your erectile health. Find out what is normal, how to contact a doctor, and what products to try for harder erections.

https://www.mayoclinic.org/diseases-conditions/erectile-dysfunction/symptoms-causes/syc-20355776
Erectile dysfunction is the inability to get and keep an erection firm enough for sex. It can be caused by physical or psychological factors, or a combination of both, and can affect your health and quality of life. Learn more about the causes, symptoms and treatments of erectile dysfunction from Mayo Clinic experts.

https://www.healthline.com/health/erection-problems
Learn about the common causes and treatments of erection problems, also known as erectile dysfunction or impotence. Find out how to prevent and manage this condition that affects sexual function and quality of life.

https://my.clevelandclinic.org/health/diseases/10035-erectile-dysfunction
Learn about erectile dysfunction (ED), the inability to get or maintain an erection long enough for sexual intercourse. Find out the common causes, symptoms, diagnosis and treatment options for ED.

https://www.mayoclinic.org/diseases-conditions/erectile-dysfunction/diagnosis-treatment/drc-20355782
Learn about the causes, diagnosis and treatment options for erectile dysfunction, a condition that affects many men. Find out how oral medications, injections, pumps, implants and other methods can help you achieve and maintain an erection.

https://www.healthline.com/health/erectile-dysfunction
Learn what erectile dysfunction (ED) is, how it affects your sexual health, and how to treat it. Find out the common causes, symptoms, diagnosis methods, and treatment options for ED.

https://www.medicalnewstoday.com/articles/how-long-can-the-average-man-stay-erect
Learn how erections work, what factors affect them, and how long they should last. Find out when to see a doctor for erection problems or priapism.

https://www.webmd.com/erectile-dysfunction/ss/erectile-dysfunction
Learn about erectile dysfunction (ED), a common problem that affects 1 in 5 men and can make sex difficult. Find out the physical and psychological causes of ED, how to diagnose it, and what options are available to treat it.

https://www.nebraskamed.com/health/questions-and-answers/erectile-dysfunction/you-asked-we-answered-why-is-my-erection-not-as
• Penile vacuum erection devices • Penile injections that increase blood flow • Surgery if none of the above work What exercise helps erectile dysfunction? While there aren't specific exercises for erectile dysfunction, maintaining a healthy body weight with regular exercise is an excellent place to start.

https://www.webmd.com/erectile-dysfunction/features/erections-use-it-or-lose-it
Learn how regular sexual activity may help preserve male sexual function and prevent ED. Find out what the research says and what urologists recommend.

https://www.ncbi.nlm.nih.gov/books/NBK513278/
Penile erection or tumescence refers to the physiologic process during which the penis becomes engorged with blood, usually in response to sexual arousal but sometimes spontaneously. Comprehension of penile anatomy, neuro-vasculature, and the associated hormonal and molecular factors is required to understand the physiology of tumescence. Understanding the physiology of erections is important

https://www.msdmanuals.com/home/men-s-health-issues/sexual-function-and-dysfunction-in-men/erectile-dysfunction-ed
To achieve an erection, the penis needs an adequate amount of blood flowing in, a slowing of blood flowing out, proper function of nerves leading to and from the penis, adequate amounts of the male sex hormone testosterone, and sufficient sex drive (libido), so a disorder of any of these systems may lead to erectile dysfunction (ED).. Most cases of ED are caused by abnormalities of the blood

https://www.britannica.com/science/erection
Learn how the penis becomes erect, hard, and elevated due to blood flow and pressure changes. Find out the anatomy and function of the erectile tissue, the corpora cavernosa, and the corpus spongiosum.

https://www.webmd.com/teens/penis-faq
An erection is when your penis fills with blood and becomes hard. A morning erection is an erection you wake up with in the morning. Morning erections are very common. In fact, most guys have

https://health.clevelandclinic.org/men-get-morning-erections-5-answers-questions
Learn why men get morning erections and how they relate to your nervous system, dreams, bladder and age. Find out when to worry about erectile dysfunction and how to treat it.

https://www.healthline.com/health/mens-health/average-penis-size
Learn about the average length and girth of an erect penis, how it compares to flaccid size, and why size doesn't matter for sex or health. Find out how to measure your penis, what methods can temporarily enlarge it, and how to build confidence.

https://www.mayoclinic.org/tests-procedures/penis-pump/about/pac-20385225
The erection typically lasts long enough to have sex. Don't leave the tension ring in place for more than 30 minutes. Cutting off blood flow for too long might injure your penis. Results. Using a penis pump won't cure erectile dysfunction. But it might create an erection firm enough for sex.

https://www.webmd.com/men/penis-changes-age
Learn how testosterone levels affect your penis size, shape, pubic hair, testicles, scrotum, and sexual function as you age. Find out about Peyronie's disease, hydrocele, and erectile dysfunction and how to treat them.