How an erection works
An erection involves the nervous system, blood vessels, hormones and psychological factors working together. When aroused, blood flow to the penis increases and is temporarily retained.
Why difficulties happen
Occasional difficulties are common. Persistent difficulties can have several causes, including cardiovascular factors, diabetes, hormonal factors, certain medications, stress or relationship factors.
A possible health signal
Because erectile function relies on healthy blood vessels, ongoing difficulties can sometimes be linked to cardiovascular health. This is one reason to speak with a doctor rather than ignoring symptoms.
When to seek advice
If difficulties persist for several weeks, cause distress, or come with other symptoms, a healthcare professional can help identify possible causes.