Bladder Infection (Acute Cystitis): Causes, Symptoms & Prevention

마지막 업데이트: 2026년 5월 18일

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 급성 방광염. 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.

신우신염 또는 신장 감염 - 그게 무엇인가요?

박테리아로 인한 방광 감염

Bladder infection can clinically present with the following symptoms:

A burning or painful sensation when urinating
배뇨에 대한 강하고 지속적인 충동
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 대장균, 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.

UTI는 항상 환자를 짜증나게 합니다.

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 나. Thanks!

If you have burning urination, urinary urgency, or suspect a bladder infection, Dr. Soarawee Weerasopone offers specialist consultations at Bangkok Hospital Headquarters. 진료 예약.

Frequently Asked Questions about Bladder Infection (Acute Cystitis)

What is acute cystitis (bladder infection)?

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.

Why do women get bladder infections more often than men?

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.

How does E. coli cause a bladder infection?

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.

Does drinking water really help prevent bladder infection?

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.

When should I see a doctor for a bladder infection?

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.

면책 조항: 본 내용은 방콕 병원 본사의 전문의인 Soarawee Weerasopone 박사가 작성하고 검토한 것입니다. 교육 목적으로만 제공되며 의학적 조언을 구성하지 않습니다. 모든 의학적 치료를 시작하기 전에 항상 자격을 갖춘 의료 전문가와 상담하십시오.

의학적으로 작성 및 검토됨: 소아라위 위라소폰 박사(폼 박사) — 방콕 병원 본원 비뇨의학과 전문의. 국제 펠로우: 베일러 의과대학(미국) · 준텐도 대학(일본) · 창궁 기념 병원(대만).

소아라위 위라소폰 박사

소라위 위라소폰 박사 (폼 박사)는 방콕 병원 본원의 비뇨의학과 전문의이며, 남성 건강, 로봇 수술 (다빈치 시스템), 요석 치료를 전문으로 합니다. 미국 베일러 의과대학, 일본 순텐도 대학 병원, 대만 창강 기념 병원에서 국제 펠로우십을 마쳤습니다. 이 사이트의 모든 의학 콘텐츠는 소라위 박사의 임상 경험과 국제 교육을 바탕으로 작성 및 검토됩니다.