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The most common penis problems:

Peyronie's Disease:
Peyronie's Disease (pay-row-KNEES) is acquired in adult life rather than at birth (like hypospadias). Men with Peyronie's disease usually seek medical attention because of painful erections and difficulty with intercourse.
François de la Peyronie, a French surgeon first described Peyronie's disease in 1743. Early writers classified it as a form of impotence, now called erectile dysfunction (ED). Peyronie's disease can be associated with ED; however, experts now recognize ED as only one factor associated with the disease, a factor that is not always present.
Unfortunately, symptoms of the disease may develop methodically or overnight. Overnight appearances are usually due to some sort of serious penile trauma, but not always. If you think that you have Peyronie's Disease, then I highly recommend you see your healthcare provider, who may refer you to an urologist.

Priapism:
Priapism is an involuntary prolonged or painful erection that can persist for hours, days and is not associated with sexual arousal. It can occur at any age and is a true emergency with risks of subsequent impotency. Primary priapism is the result of trauma or infection. Secondary causes include sickle cell disease, spinal cord injury and stroke. Various medications can also contribute to this condition.

Very few cases of priapism are without an obvious cause. In most cases, priapism results from one of two things: certain medications or medical conditions. Under the category of medications, there are two primary culprits. For one, penile injections used to treat some forms of impotence can cause priapism; however, this usually only happens when a man decides, on his own, to increase the dosage. Second, psychiatric medications, such as anti-depressants, seem to cause some cases of priapism; however, how these drugs affect priapism is unclear. The second major cause of priapism is certain medical conditions and diseases -- generally, any that cause the blood to thicken, or cause red blood cells to lose their flexibility and mobility. Sickle-cell anemia and leukemia are probably the most common conditions that cause priapism.

Phimosis:
Phimosis refers to a tightening of the skin of the foreskin that prevents retraction over the glans—the sensitive erectile tip of the penis. There are two typical forms of this tightness: an infant phimosis and the phimotic ring or band.

An infant phimosis has an easily recognizable tubular form, this is common and healthy in infants but occasionally will continue into adulthood. The adult phimosis is a thin contour of skin tissue located towards the front of the inner foreskin and it narrows the opening of the foreskin. A phimotic ring can make retraction of the foreskin over and behind the glans impossible, painful, or difficult, the foreskin may even get stuck behind the glans. This condition is often treated by circumcision, however, there are less invasive procedures depending upon the degree of phimosis, see several urologists for opinions if you have this condition.