Background: Bladder cancer (BC) is one of the most common urological malignancies. It is the fourth most common cancer in men and eighth most common malignancy in women of the western world. As per the Indian cancer registry, BC constitutes the ninth most common malignancy and accounts for an overall 3.9% of all cancer cases. Aim: to determine the etiological of urinary bladder carcinoma patients. Material and methods: This Prospective observational study was done in the Department of Surgery, Anugrah Narayan Magadh Medical College and Hospital, Gaya, Bihar for 24 months. 200 patients with a diagnosis of bladder cancer were included in the study. Clinical details including history of hematuria, smoking, daily fluid intake, dietary history, symptoms of urinary tract infection (UTI), loss of weight/appetite, past medical history and blood tests including hemogram, renal function tests, liver function tests, imaging like ultrasonography of kidney, ureter, urinary bladder (USG KUB), Cystoscopy and guided biopsy, contrast enhanced computed tomography of kidney, ureter, urinary bladder (CECT KUB) (if needed) and chest X-ray (CXR) was done in all the patients as per the standard protocol in the department of surgery. Results: The mean age of presentation of carcinoma urinary bladder was 54.26 years. The male to female ratio was 4:1. The mean age of presentation of carcinoma urinary bladder was 54.26 years (29-84 years) with the maximum number of patients being in the age group of 60-70 years followed by below 40 years. 90% of the patients of carcinoma urinary bladder in our study were non-smokers. History of UTI was present in only 25.5% of the patients of carcinoma urinary bladder. Maximum number of patients of carcinoma urinary bladder belonged to A+ blood group followed by B+ and the least number of patients belonged to Oblood group. The maximum number of patients of carcinoma urinary bladder was labourers by occupation followed by farmers and housewife in females’ subset. As shown in the table the maximum number of patients of carcinoma urinary bladder was Hindus followed by Muslim. Conclusion: the majority of the patients turned out to be non-smokers and A +ve blood group in contrast to the strong predilection of smoking and bladder cancer.