Introduction. The risk of being exposed to Covid-19 as well as the restrictions imposed on accessing certain medical services have caused many patients to delay or avoid seeking referrals for specialized medical care in the case of oncological diseases. Aim. Determination of the impact of the Covid-19 pandemic on the detection of new cases of cancer. Material and methods. We analyzed the statistical data from the National Cancer Registry regarding oncological diseases diagnosed between 2018 and 2022. The total number of patients and disease stages were compared for the specified period. Results. During the Covid-19 pandemic, the total number of detected cases decreased by 17.8% (n=1847), returning to prepandemic levels in the post-Covid-19 period. For some cancer types, there was a significant increase in incidence compared to pre-pandemic data. The largest difference was recorded in the cases of breast, prostate, and colon cancer, which decreased by 13.7% (n=161), 18.36% (n=109), and 16% (n=117), respectively. Additionally, we observed an increase in the number of patients with locally advanced cancers, with prostate cancer exhibiting a 35% increase (n=109), breast cancer demonstrating a 22.6% increase (n=30), and lung cancer demonstrating a 14.7% increase (n=82). Conclusions. The Covid-19 pandemic has had a negative impact on timely access to specialized medical care, resulting in the diagnosis of patients at an advanced stage of disease.