RESUMEN
OBJECTIVE: Introduction: Colorectal cancer is one of the most frequently diagnosed cancer worldwide. Abdominal pain, alteration of chronic bowel habits, changes in bowel movements and involuntary weight loss belong to typical symptoms. It is important to diagnose the disease in early stage to improve effectiveness of treatment. The aim: To present a case report of exertional dyspnoea in patient with newly diagnosed colorectal cancer without any symptoms and abnormalities in physical examination suggesting malignant process of digestive tract. PATIENTS AND METHODS: Case report: We present a 71-year-old male who has been admitted to the Department of Internal Medicine, Angiology and Physical Medicine under emergency care, where was aimed at by general practitioner to diagnose exertional dyspnoea ongoing last few weeks, which appearing after two hundred meters walk on flat surface. In the course of the diagnostic process, it turned out that the cause of dyspnoea was colorectal cancer. CONCLUSION: Conclusions: This case report shows that initial symptoms of cancer may be nonspecific and it confirms how important it is for doctors to remain vigilant in the diagnostic process.