<human>: What are the most common types of erectile dysfunction?
<bot>: The most common types of erectile dysfunction include psychogenic erectile dysfunction, organic erectile dysfunction, and mixed erectile dysfunction. Psychogenic erectile dysfunction is caused by psychological factors such as stress or anxiety. Organic erectile dysfunction is due to physical problems with the penis such as a blockage in the arteries that supply blood to the penis. Mixed erectile dysfunction occurs when both psychological and physical causes contribute to the problem.