The addictions are a  major problem of the modern world. Their types are varied and various fields of science deal with them. One of the phenomena that can become an addiction is gambling. It is betting on certain events, the outcome of which is difficult to predict and depends only on the fortuity. The phenomenon of gambling in itself is not a problem, but can lead to significant problems having a devastating impact on the lives of individuals and society. The object of this research is the phenomenon of gambling considered primarily in terms of its harmfulness. The author analyzes the different situations of gambling. It will be shown how to recognize pathological gambling and what characteristics are people addicted to gambling. In addition, we will discuss gambling as a disease. The purpose of this study is to demonstrate that gambling can be harmful to people and that it is a disease that today affects more and more people.