Study: Color blindness may mask an early warning sign of bladder cancer, linked to lower long-term survival
Latest news on WhatsApp أجدد الأخبار على واتسابA Stanford Medicine-led study suggests that color blindness, also known as color vision deficiency, may make it harder for some people to notice blood in the urine, one of the most common early warning signs of bladder cancer, potentially delaying medical evaluation.
Published on January 15, 2026 in Nature Health, the research used electronic health records from the TriNetX network. The authors identified 135 patients with both color vision deficiency and bladder cancer and compared them with 135 matched bladder cancer patients without color vision deficiency. The color-blind group showed shorter overall survival, with a 52% higher overall mortality risk over 20 years.
The authors propose a plausible explanation: difficulty perceiving red may reduce the likelihood of recognizing visible blood in urine, which often triggers early care-seeking. Medical references note that hematuria, whether gross or microscopic, is a common initial symptom in bladder cancer and warrants clinical assessment.
Researchers emphasized the work is hypothesis-generating and does not prove causation, noting limitations such as reliance on diagnostic coding and the likelihood that many people with color vision deficiency are never formally diagnosed
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Tahani Elghazaly5252 Posts
