Most men diagnosed have no symptoms of prostate cancer - it rarely causes symptoms before it's metastatic, and often not even then for a while. The symptoms most frequently talked about are the lower urinary tract symptoms (LUTS) of urgency, getting up many times at night, hesitancy, peeing slowly, etc. These are almost always due to an enlarged prostate, which is not usually cancer, but Benign Prostatic Hyperplasia (BPH). A recent research paper has highlighted that talking about prostate cancer symptoms is causing men without symptoms to assume they're OK, which absolutely isn't the case and is delaying many diagnosis. Actually, it looks like BPH slightly lowers your risk of prostate cancer, so it's probably the men with no symptoms who are at higher risk.
Blood in urine/semen, and loss of erections are still important symptoms which, although not often prostate cancer, can be other serious things that need picking up quickly.
When doing awareness, rather than mentioning symptoms, you should concentrate on mentioning risks. These would be:
Being aged 50 or older, 1 in 8 men (or 1 in 6 men born since 1960) will get prostate cancer.
For Black men, this is age 45 or older, and 1 in 4 men will get prostate cancer.
Having a brother or father with prostate cancer more than doubles the risk.
Having a mother or sister with breast cancer below age 60 increases the risk by around 20%.
Ideally, you want prostate cancer detected before it's causing any symptoms.
The risk of over treatment has reduced massively in the last 5 years, with the introduction of mpMRI before biopsy, and with the use of Active Surveillance.