How many different diseases are there in the world?
There are four main types of disease: infectious diseases, deficiency diseases, hereditary diseases (including both genetic diseases and non-genetic hereditary diseases), and physiological diseases.
Diseases can also be classified in other ways, such as communicable versus non-communicable diseases.
What are the 10 most common diseases?
- Unintentional injuries.
- Chronic lower respiratory disease.
- Stroke and cerebrovascular diseases.
- Alzheimer’s disease. Deaths in 2017: 121,404.
- Diabetes. Deaths in 2017: 83,564.
- Influenza and pneumonia. Deaths in 2017: 55,672.
- Kidney disease. Deaths in 2017: 50,633.
- Suicide. Deaths in 2017: 47,173.
How many rare diseases are there in the world?
There are between 5 000 and 8 000 rare diseases, most of them with a genetic basis. 1 A very rough estimate would be that one out of 15 persons worldwide could be affected by a rare (“orphan”) disease – 400 million people worldwide, of whom 30 million are in Europe and 25 million in the United States.
What are the most common diseases in the world?
So, without further ado, here are the five most common infectious diseases.
- Hepatitis B. According to current statistics, hepatitis B is the most common infectious disease in the world, affecting some 2 billion people — that’s more than one-quarter of the world’s population.
- Hepatitis C.