Today's world faces many challenges: climate change due to global warming, hunger and malnutrition in third world countries due to poverty, poor governance and endless corruption, wars and conflicts, and the list goes on. But the issue of communicable diseases is what worries most people in all countries, especially in third world countries. In fact, a large percentage of deaths worldwide are caused by infectious diseases. This concern must be addressed first, among other issues. Communicable diseases not only affect a single country, they can also become a pandemic. Above all, communicable or infectious diseases are a major problem worldwide. HIV/AIDS (human immunodeficiency virus/acquired immunodeficiency syndrome), SARS (severe acute respiratory syndrome), and swine flu (H1N1) are among the communicable diseases that have recently affected the world. Among these communicable diseases, HIV/AIDS is considered the biggest threat endangering the entire planet. According to the WHO (World Health Organization), the number of people infected with HIV has increased by 50% since 2004. The Joint United Nations Program on HIV/AIDS reports that from its discovery in 1981 until 2006 , AIDS has killed more than 25 million people. people. Additionally, HIV/AIDS does not choose a specific person to infect. Anyone can become infected with HIV/AIDS or other infectious diseases if proper precautions are not followed. It has been claimed that the health problems of another country, especially developing countries, should be left to the government alone. It is the responsibility of governments to tackle the problems of their own countries. However, a country's health problems have the potential to become paper measures to avoid contracting these diseases. People should avoid traveling to places known to contain infectious diseases. Getting vaccinated at health centers is also one of the best preventive measures. Finally, always wash your hands in public places. In conclusion, communicable diseases are so alarming that they cannot be ignored. Every person in the world is at risk of being infected with various infectious diseases. This issue must be the first priority of every government. This can affect not only their country, but also the whole world. Building more health centers in poverty-stricken communities can reduce the chances of disease spreading in a small area. Thus, the risk of creating a pandemic is reduced. Additionally, following proper preventive measures will help reduce the risk of contracting infectious and deadly diseases..