As far as the health of young people is concerned the positive trends include: a decline in mortality rates, physical development of children and young people (increased body height), reduced prevalence of infectious diseases covered by the compulsory vaccination programme; significant improvement in treating cancer in children. On the other hand, Poland still faces several negative phenomena, such as for example obesity among young people, declining physical fitness levels, mental health problems, allergies or consequences of risky behaviours. A recent negative trend is anti-vaccines movement which results in an increased number of infectious diseases cases amongst young people. Long-term consequences of the COVID-19 pandemic for the younger generation are not yet fully known. However, it seems that it will exacerbate negative phenomena in areas of young people’s mental health and fitness.