Yes, when benign prostatic hypertrophy (BPH) is mild and at initial stage, one may not suffer from outlet obstruction. When BPH severity increases it can leads to outlet obstruction giving rise to lower urinary tract symptoms.
The information given above is for Benign Prostatic Hyperplasia which is the active ingredient of Benign Prostatic Hyperplasia.

Prostate-specific antigen (PSA) is a marker or a substance that is produced by prostate and it is used to diagnose certain diseases of prostate. PSA level is increased in enlarged prostate (BPH), prostate cancer, and prostatitis.
The information given above is for Benign Prostatic Hyperplasia which is the active ingredient of Benign Prostatic Hyperplasia.

Although allopathic medicine and surgery are most effective treatments available for benign prostatic hyperplasia (BPH), phytotherapy, i.e., using herbal medicines are also commonly used. Saw Palmetto (Krakach taal), African prune tree, and common nettle (bichu booti) have shown to be very useful in improving urinary symptoms of BPH.
The information given above is for Benign Prostatic Hyperplasia which is the active ingredient of Benign Prostatic Hyperplasia.