There is no accepted definition of what comprises BPH. The
first microscopic changes of hyperplasia tend to develop in the prostate around
age 35. All men eventually develop BPH if they live long enough.
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Only ±50% of men with histological (microscopic) evidence of BPH will have
symptoms related to their prostatic enlargement. An enlarged prostate gland
will not necessarily cause obstruction or symptoms.
The clinical syndrome (symptoms and signs) related to prostatic enlargement
goes by many different names, including BPH, LUTS (lower urinary tract
symptoms), prostatism and bladder outflow obstruction.
50% of men aged 51-60 years and 90% of men over 80 years have histological BPH.
However, only 25% of 55-year-old men and 50% of 75-year-old men will have
bothersome symptoms related to their prostatic enlargement.
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