I did a survey of some local support groups some years ago, and 10% of those diagnosed said they had to make up symptoms to get the PSA test which resulted in their diagnosis.
That figure is likely to be significantly higher now that several celebs have been telling people to make up symptoms.
In the UK, around 80% of those diagnosed had no symptoms of the cancer.
In the US, it's 85% (reported at EAU 2025), but they do more testing so that's believable.
Interestingly, the symptom most reported by our patients is one clinicians never ask about - loss or significant reduction of semen.