The natural history of untreated BPH is variable and unpredictable. There is little reliable information in the medical literature. It is clear, however, that BPH is not necessarily a progressive disease.
Many studies indicate that in up to 30% of patients symptoms may improve or disappear over time. In ±40% of patients symptoms stay the same and in 30% of patients symptoms get worse. ±10% of untreated patients will eventually develop retention of urine. 10-30% of untreated patients eventually need surgery for their prostatic enlargement.