What is the most common type of disease in the world?

Disease is a major global health challenge that affects millions of people around the world. According to the World Health Organization (WHO), the most common types of diseases vary depending on factors such as age, gender, and location. However, in general, communicable diseases (infectious diseases) are the most common types of diseases worldwide.

The most common communicable diseases include respiratory infections, diarrheal diseases, and tuberculosis. Respiratory infections, which include pneumonia and influenza, are responsible for the most deaths worldwide, especially among children and the elderly. Diarrheal diseases, such as cholera and dysentery, are also common and can cause severe dehydration and death if left untreated. Tuberculosis, an airborne bacterial infection that primarily affects the lungs, is another leading cause of death worldwide.

Non-communicable diseases (NCDs), such as heart disease, cancer, and diabetes, are also common globally, especially in high-income countries. These diseases are often linked to lifestyle factors such as diet, physical inactivity, and tobacco use. According to the WHO, NCDs account for approximately 71% of all deaths worldwide.