The prostate is a gland， weighing 25 gram， below the bladder. Because it is situated around the urethra (bladder pipe)， enlargement causes obstruction in urethra. Enlargement occurs naturally with age， and might be accompanied by cancerous change.

　　Symptoms are usually slow in onset， starting with dribbling， getting up at night， weak stream， urgency and hesitancy. The symptoms tend to get worse progressively， and might culminate in retention.

　　After the age of 45， men should have their prostates checked annually， including blood tests and a rectal examination.

　　前列腺常识

　　前列腺是一个重25克的腺体，位于膀胱下方。由于它位于尿道(通向膀胱的管道)周围，它增大时可引起尿道阻塞。前列腺会随着年龄增大，也会癌变。

　　初发病时症状轻微，有夜间滴白，射尿无力，尿急，排尿踌躇。症状逐渐加重，重者可引起尿潴留。

　　45岁以上的男性每年应检查一次前列腺，包括血液检查和直肠检查。

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