Introduction: Transurethral resection of bladder tumors is the most common treatment for bladder cancer. Marjorie Gordon proposed patterns of health functioning. She divided patterns of health functioning into 11 categories that allow nurses to identify 11 aspects of health and human functioning to plan necessary health care. Aim: To examine the frequency of nursing diagnoses based on patterns of health function occurring in the first three days in patients after transurethral bladder resection. Subject and methods: The subjects were adult patients of both sexes who were hospitalized after transurethral bladder resection in the Urology department, the University Hospital Center Split. The study was conducted from May to July 2021 in the Urology department, the University Hospital Center Split, and the patients were observed in the first three days immediately after transurethral resection of the bladder. The questionnaire was compiled for the purpose of this study and consists of three independent parts (socio-demographic questionnaire, data from nursing documentation, occurrence of health function problems). Results: The most common admission diagnosis in all patients observed (n=47; 78,33%) was malignant neoplasm of the urinary bladder. According to the assessment of patients’ independence, most patients were highly dependent, had a high risk of developing pressure wounds, a moderate risk of falls and were categorised as II (n=54; 90,00%). All observed patients had a high risk of bleeding and a high risk of infection on the first postoperative day according to the health function forms in the „Perception and Health Maintenance“ form (n=60; 100,00%); the most common problem present in the „Nutrition – Metabolism“ form was „Vomiting“ (n=26; 43,33%); in the „Excretion“ form „Urinary retention“ (n=58; 96,67%); in the „Activity“ form, all patients had limited ability to care for themselves in terms of hygiene, excretion and dressing (n=60; 100,00%); in the „Sleep – Rest“ form, „sleep dissorder“ (n=52; 86,67%); in the „Cognitive – Perceptual Functions“ form, „acute pain“ was present in all patients (n=60; 100,00%); in the „Self-Perception“ form, „anxiety“ (n=52; 86,67%); in the „Sexual Activity and Reproduction“ form „sexual dysfunction“ (n=37; 61,67%); in the form „Role and Relationships with others“ „social interaction disorder“ (n=51; 85,00%); in the form „Confrontation and Stress tolerance“ „ineffective stress confrontation“ (n=30; 50,00%); in the form „Values and Attitudes“„religion disorder“ (n=30; 50,00%). All observed problems had a lower incidence on the third postoperative day except for „Constipation“ (n=35; 60,00%) and „high risk of constipation“ (n= 36; 60,00%), which had a higher incidence, and the problem of „inefficient health care“ (n=4; 6,67%) had the same incidence throughout all three observed days. Conclusion: The majority of patients (98,33%) have a nursing diagnosis trough seven of eleven forms of health function. Patients over 65 years of age have a higher ratio of nursing diagnoses than those under 65 years of age. The increased occurrence of ailments among patients did not lead to an increase in nursing diagnoses compared to patients without ailments. Patients with diuresis stimulation for three days had more nursing diagnoses than the patients who had a 2 day stimulation. Patients with clear urine had fewer nursing diagnoses and the diagnoses were of shorter duration than those with hematuric and concentrated urine. The most of the nursing diagnosis are present on the first postoperative day. On the first postoperative day, all patients had a nursing-medical problem „high risk of bleeding“.