In Peyronie's disease, scar tissue makes the penis bend or curve during an erection. When a guy gets an erection, chambers on the side of the penis fill with blood. But with Peyronie’s, scar tissue (also called plaque) on the sheath keeps your penis from standing straight.
Bent penis: Symptom — Overview covers definition, possible causes of this condition.
It's common for the penis to curve slightly to the left or right when it's erect. Peyronie's disease causes the penis to become curved when it's erect. a curve in the penis when it's erect (usually it curves upwards).