最終更新日： 2026年5月18日
Bladder cancer is the most common cancer in our urinary tract system. The classic presenting symptom is blood in urine (hematuria) without pain. There are 2 major risk factors that could lead to bladder cancer. Smoking and occupational exposure to certain chemicals. We will talk a little bit in detail about that.
2 Major risk factors of Bladder cancer
- 喫煙
Tobacco consumption is the most significant risk factor for bladder cancer. Approximately 50% of bladder cancer patients have a history of smoking. Smoking doubles the cancer risk by up to 600% compared to non-smokers. The risk correlates directly with duration and intensity of smoking. Even after quitting, elevated cancer risk persists for decades. The risk from electronic cigarettes remains under investigation.
- Occupational exposure
10–20% of bladder cancer cases are attributed to occupational exposure. Workers unable to avoid inhaling chemicals used in the manufacture of dyes, paint, rubber, and petroleum products are at increased risk. This risk can be mitigated through proper industrial work-safety guidelines and protective equipment.
Once someone presents with blood in urine, I highly recommend seeking medical expert consultation as soon as possible. A urologist will perform a full medical history, physical examination, and specific urine tests. CT scan with contrast is an important imaging tool to investigate suspicious bladder cancer and differentiate it from bladder infection or kidney stones.
Endoscopic surgery (cystoscopy) plays an essential role in bladder cancer diagnosis and treatment. It allows direct visualization, biopsy, and surgical removal of tumors. Remember – “Better safe than sorry.” If you experience painless blood in urine, seek proper urological evaluation without delay.
If you are interesting to the topic or coincidently you have problem very similarity to the symptoms above, please find the trusted urologist for the correct and proper diagnostic and therapeutic or you can feel free to contact 私. Be healthy my friends.
If you have experienced painless blood in urine or would like a bladder cancer evaluation, Dr. Soarawee Weerasopone offers specialist consultations at Bangkok Hospital Headquarters. 診療をご予約.
Frequently Asked Questions about Bladder Cancer
The most classic and common symptom of bladder cancer is painless hematuria – blood in the urine without any associated pain. This is the hallmark warning sign that should prompt immediate urological evaluation. Because it is painless, patients sometimes ignore it or attribute it to other causes, which can delay diagnosis. Any episode of blood in urine, even a single occurrence, warrants investigation.
Yes. Smoking is the single most significant risk factor for bladder cancer, responsible for approximately 50% of cases. Smokers have up to 600% higher bladder cancer risk compared to non-smokers. The risk increases with both the duration and intensity of smoking. Importantly, quitting smoking reduces risk over time but elevated risk persists for decades after cessation.
Workers with chronic occupational exposure to aromatic amines and other chemicals used in the production of dyes, rubber, paint, and petroleum products account for 10–20% of bladder cancer cases. Other risk factors include older age, male sex, chronic urinary tract infections, and certain medications such as cyclophosphamide used in chemotherapy.
Bladder cancer diagnosis typically involves a combination of urine cytology (microscopic examination for cancer cells), CT urography with contrast (to assess the entire urinary tract), and cystoscopy (direct endoscopic visualization of the bladder interior). Cystoscopy allows for biopsy and transurethral resection of suspicious lesions, serving as both a diagnostic and therapeutic tool.
Yes. When detected early, bladder cancer has excellent treatment outcomes. Non-muscle-invasive bladder cancer (the most common type) is treated with endoscopic resection and intravesical therapy, with high survival rates. Muscle-invasive cases require more aggressive treatment including radical cystectomy or chemoradiation. Early detection through prompt evaluation of hematuria is critical to achieving the best outcomes.
**免責事項:** このコンテンツは、バンコク病院本部の認定泌尿器科医であるSoarawee Weerasopone博士によって作成およびレビューされました。教育目的のみのものであり、医学的アドバイスを構成するものではありません。いかなる医療処置を開始する前にも、必ず資格のある医療専門家にご相談ください。.
医学的に記述・監修： ソアラウィー・ウィーラソポーン医師（ポム医師） — バンコク病院本社 泌尿器科専門医。 国際フェロー：ベイラー医科大学（米国）、順天堂大学（日本）、長庚紀念医院（台湾）。.
ソアラウィー・ウィーラソポーン医師（ポム医師）は、バンコク病院本院の泌尿器科専門医で、男性医学、ロボット手術（ダヴィンチシステム）、腎結石治療を専門としています。ベイラー医科大学（米国）、順天堂大学医学部附属順天堂医院（日本）、長庚記念医院（台湾）での国際フェローシップを修了しています。このサイトのすべての医療コンテンツは、ソアラウィー医師の臨床経験と国際的なトレーニングに基づいて、同医師によって作成・監修されています。.
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