Prostate-Specific Antigen (PSA) is an enzyme produced by the prostate gland in men, which regulates the consistency of semen. A very small portion of PSA enters the bloodstream. In various prostate conditions such as benign prostatic hyperplasia (BPH), prostate infections (prostatitis), and prostate cancer, blood PSA levels can increase. Measuring blood PSA levels and their changes over time can provide valuable insights into prostate health and suggest the nature of potential diseases.