Final answer:
Decreased ejaculatory force is a symptom of benign prostatic hyperplasia (BPH), which is caused by abnormal growth of the prostate gland leading to urethral constriction.
Step-by-step explanation:
One symptom of benign prostatic hyperplasia (BPH) is a decreased ejaculatory force. BPH is characterized by abnormal growth of the prostate gland, which can lead to constriction of the urethra. This constriction predominantly causes lower urinary tract symptoms, primarily affecting the process of urination; however, it can also impact ejaculatory function. The decreased force is due to the pressure on the urethra and surrounding muscles and nerves that may affect the mechanism of ejaculation.