最后更新： 2026年5月18日
There are so many patients came to see me at my office complained on the bladder infection or in the medical term we have called it 急性膀胱炎。. They asked me “Why was it me?” – a few are suffering this symptom for the first time, and many have been through it repeatedly throughout their lives. For this topic, I’m going to show you the bladder’s mechanism on how it gets infected, so you can visualize the whole picture of this bothersome condition.
Bladder infection can clinically present with the following symptoms:
- A burning or painful sensation when urinating
- 排空后仍有尿不尽感
- Passing frequent small amounts of urine
- Pressure and pain in the lower abdomen
- Blood in the urine (hematuria) – rare but alarming
Bladder infection predominantly targets women. About 10% of women experience bladder infection every year, and at least 1 in every woman will suffer at least one episode in her lifetime. The most common cause is 大肠杆菌, a bacterium that normally lives harmlessly in the large intestine. After passing feces, E. coli can colonize the perineum and vagina, then ascend to the urethra and bladder using its adhesive surface structures.
The body has natural defenses – normal urine flow can flush bacteria out, and the immune system works to eliminate invaders. However, some strains of E. coli are able to camouflage inside bladder cells, hiding from the immune response. When this defense is overcome, bladder infection occurs and antibiotic treatment becomes necessary.
A simple bladder infection should not occur more than 2 times within 6 months or 3 times within a year. If it does, it is classified as recurrent bladder infection and requires further investigation to identify and address the underlying cause.
Prevention is always better than treatment. Here are evidence-based recommendations:
- Drink more than 2 liters of water daily and keep urine color bright yellow or clear
- Do not delay urination – holding urine gives bacteria more time to multiply
- Several over-the-counter supplements can help reduce recurrence rate
If you have questions or symptoms are not improving despite behavioral changes, text 我. Thanks!
If you have burning urination, urinary urgency, or suspect a bladder infection, Dr. Soarawee Weerasopone offers specialist consultations at Bangkok Hospital Headquarters. 预约咨询.
Frequently Asked Questions about Bladder Infection (Acute Cystitis)
Acute cystitis is a bacterial infection of the urinary bladder, most commonly caused by E. coli. It typically presents with a burning sensation during urination, frequent and urgent need to urinate, lower abdominal discomfort, and occasionally blood in the urine. It predominantly affects women, with approximately 10% experiencing at least one episode per year.
Women are anatomically more susceptible to bladder infections because the female urethra is much shorter than the male urethra, making it easier for bacteria from the perineum and vaginal area to ascend to the bladder. The proximity of the urethral opening to the anus also facilitates E. coli contamination. Hormonal factors, especially low estrogen after menopause, further reduce natural protective barriers.
E. coli normally lives harmlessly in the large intestine, but after bowel movements it can colonize the perineum and vaginal area. From there, it ascends through the urethra into the bladder. E. coli uses surface appendages called fimbriae to attach to bladder mucosal cells, and some strains can invade and hide inside bladder cells, evading the immune response and antibiotic treatment – which is why recurrent infections occur.
Yes. Adequate water intake is one of the most effective and simple preventive measures. Drinking more than 2 liters of water daily increases urinary output, which physically flushes bacteria from the bladder before they can establish an infection. Pale yellow or clear urine indicates adequate hydration. Conversely, concentrated dark yellow urine suggests insufficient fluid intake and higher infection risk.
You should consult a doctor if symptoms do not improve within 2–3 days of starting treatment, if you develop fever or back pain (which may indicate kidney infection), if you notice blood in the urine, or if you have 2 or more infections within 6 months. Recurrent infections require a full urological evaluation to identify underlying anatomical or hormonal causes.
**免责声明：** 本内容由曼谷医院总院的认证泌尿科医生 Soarawee Weerasopone 医生撰写和审阅。本内容仅用于教育目的，不构成医疗建议。在开始任何医疗治疗前，请务必咨询合格的医疗专业人士。.
医学撰写与审阅： 素瓦瑞·维拉宋蓬医生（Pom医生）— 曼谷医院总部认证泌尿科医生。 国际学者：贝勒医学院（美国）· 顺天堂大学（日本）· 长庚纪念医院（台湾）。.
素瓦拉维·维拉索蓬医生（Pom 医生）是曼谷医院总部的注册泌尿科医生，专长于男性健康、机器人手术（达芬奇手术系统）和肾结石治疗。他曾在贝勒医学院（美国）、顺天堂大学医院（日本）和长庚纪念医院（台湾）完成国际深造。本网站所有医疗内容均由素瓦拉维医生根据其临床经验和国际培训撰写和审阅。.
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