Does erectile dysfunction sometimes clear up by itself?

Yes, it does. Especially if it was the result of a stressful situation which has been resolved, or an injury that has healed. What is priapism? In layman's terms, basically an erection that won't subside. This can be caused by anti-impotence drugs. This condition can be dangerous and can cause permanent damage to your penis. If an erection lasts for more than four hours, you need to get to a doctor immediately.