Bladder Infection (Cystitis): Why It Happened to You

最后更新： 8 月 15, 2026

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A great many patients come to my office with a bladder infection — 急性膀胱炎。 in medical terms — and nearly all of them ask the same question: why me? For some it is the first time; for others it has been happening on and off for years. This article answers that question by explaining how bacteria actually get into the bladder, because once you can picture the route, both the risk factors and the prevention make sense.

What it feels like

• Burning or pain on passing urine
• A strong, persistent urge to go
• Passing small amounts, frequently
• Pressure and pain low in the abdomen
• Blood in the urine — uncommon, and alarming when it happens, but not in itself a sign of anything worse

Two things change the picture and mean you should be seen the same day rather than waiting: a fever, or pain in the back or flank. A simple bladder infection does not cause either. Both suggest the infection has travelled up to the kidney — 急性肾盂肾炎 — which is a far more serious illness and needs prompt treatment.

How the bacteria get in

Bladder infection overwhelmingly affects women: about 10% of women have one each year, and most women will have at least one episode in their lifetime. The reason is anatomical — the female urethra is short, and its opening sits close to the anus.

The usual culprit is 大肠杆菌, a bacterium that lives harmlessly in the large intestine and causes no trouble at all while it stays there. After a bowel movement it can settle on the perineum and vagina, and from there it climbs the urethra into the bladder, using tiny surface appendages to grip the bladder lining rather than being washed away.

The body is not defenceless. Simply passing urine flushes bacteria out mechanically, and the immune system attacks what remains. But some strains of 大肠杆菌 hide inside the cells of the bladder wall, where neither the immune system nor an antibiotic reaches them easily. That is what tips the balance into infection — and it is also why infections come back in some women and not others.

When it stops being a one-off

A simple bladder infection should not happen more than twice in 6 months or three times in a year. Past that threshold it is called 复发性膀胱炎, and it deserves proper investigation rather than another antibiotic course — there is often a correctable reason behind it.

What actually prevents the next one

• Drink more than 2 litres of water a day, enough to keep your urine pale yellow or clear. This is the simplest and most effective measure there is — it works by flushing bacteria out before they can take hold.
• Do not hold on. Delaying gives bacteria more time to multiply in a warm, still bladder.
• Pass urine soon after intercourse, which flushes the urethra before bacteria can ascend.
• Where infections keep returning, several non-antibiotic measures reduce the recurrence rate — worth reading if this is a recurring pattern rather than a first episode.

如果您有排尿时感到灼痛、尿急，或者怀疑患有膀胱感染，Soarawee Weerasopone 医生将在曼谷医院总部提供专家咨询。. 预约咨询. 如需预约三美泰是拉差医院，请致电泌尿科： 088-022-1445.

膀胱感染（急性膀胱炎）常见问题解答

免责声明 本文由曼谷医院总院的董事会认证泌尿科医师索拉维·维拉索蓬（Soarawee Weerasopone）博士撰写并审核。本内容仅供教育目的，不构成医疗建议。通过私人消息渠道不提供任何医疗建议、诊断或处方。在开始任何医疗治疗之前，请务必咨询合格的医疗保健专业人员。.