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Some men have a slight natural curve in their penis, which is nothing to worry about.
However, if you are experiencing pain, you may be suffering from Peyronnie's disease. Its exact cause is unknown, but it often runs its course without requiring treatment. There is some evidence that Peyronie's disease is an autoimmune disorder and perhaps hereditary, but the majority of cases are probably the result of trauma. The initial accident may be minor, but as the injury heals, scar tissue forms and deformation results. Over time, the curvature often becomes less severe but seldom straightens completely.