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.
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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