Schistosomiasis and Bladder Cancer

Schistosomiasis, also known as bilharzia, is a disease caused by parasitic worms and is recognized as a significant risk factor for developing bladder cancer, particularly squamous cell carcinoma of the bladder. This article explores the link between schistosomiasis and bladder cancer, including how the infection contributes to cancer development, common symptoms, and preventive measures.

Understanding Schistosomiasis

Schistosomiasis is a disease caused by infection with freshwater parasitic worms in certain tropical and subtropical regions. The parasites are released from infected snails and can penetrate human skin during contact with contaminated water. Once inside the body, the parasites develop into adult worms, live in the blood vessels, and lay eggs. Some of these eggs travel to the bladder or intestines and are passed out of the body in urine or feces, but others become trapped in body tissues, causing inflammation and scar tissue.

The Link to Bladder Cancer

Chronic schistosomiasis, particularly when it involves the urinary tract, can lead to a specific form of bladder cancer known as squamous cell carcinoma. The inflammation caused by schistosome eggs deposited in the bladder wall can lead to chronic irritation and scarring. Over time, this prolonged inflammation can cause changes in the bladder cells, leading to the development of cancer. Studies have shown a strong correlation between schistosomiasis and the increased incidence of squamous cell carcinoma of the bladder in regions where the infection is endemic.

Symptoms of Schistosomiasis-Related Bladder Cancer

The symptoms of bladder cancer related to schistosomiasis do not differ significantly from those caused by other types of bladder cancer. These can include blood in the urine, painful urination, frequent urination, and a feeling of urgency to urinate. However, individuals with schistosomiasis might also experience additional symptoms related to the infection itself, such as abdominal pain, diarrhea, and bloody stool.

Diagnosis and Treatment

Diagnosing bladder cancer in the context of schistosomiasis involves the same procedures used for other forms of bladder cancer, including urine tests, cystoscopy, and imaging tests like CT scans or ultrasounds. Treatment may include surgical removal of the tumor, chemotherapy, or radiation therapy, depending on the stage and severity of the cancer.

In terms of schistosomiasis, antiparasitic medications like praziquantel are used to treat the infection. Managing schistosomiasis effectively can reduce the risk of developing bladder cancer associated with the infection.

Prevention and Control

Prevention of schistosomiasis is crucial in regions where the disease is common. Efforts include improving access to clean water, reducing contact with contaminated water, and snail control programs to break the lifecycle of the parasite. Public health education on the risks associated with schistosomiasis and its connection to bladder cancer is also vital. For travelers to endemic areas, avoiding swimming or bathing in freshwater lakes and rivers can prevent infection.


The relationship between schistosomiasis and bladder cancer, specifically squamous cell carcinoma, highlights the importance of addressing infectious diseases as a key component of cancer prevention in affected regions. Understanding this link can help in developing strategies for prevention, early detection, and treatment of bladder cancer in populations at risk due to schistosomiasis. Regular medical check-ups and prompt treatment of schistosomiasis are essential steps in reducing the incidence of related bladder cancer.


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