Researchers from

Tufts University

, using large-scale population surveys, found that certain blood types are associated with a greater risk of stroke, heart disease and even cancer.

What are the human blood groups

There are four blood groups: O (І), A (II), B (III), AB (IV).

Each person's blood type is based on specific antigens.

They are molecules that stimulate the immune response and are present on the outside of red blood cells.

Blood types are genetic and come from a variation in a single gene in the human body, called the ABO gene.

This is something that no human being can change.

However, we can study how blood types affect the risks of various diseases and improve our understanding of why certain people develop certain health problems.

Heart diseases

According to the American Heart Association, people with blood types A (II), B (III), and AB (IV) have a greater risk of having a heart attack due to coronary heart disease than those with blood type O (I).

And people with AB (IV) blood group have the highest risk, in particular.

Also, these three blood groups are associated with a higher risk of blood clotting disorders.

According to a recent


, people with blood type A (II) are more likely to suffer a stroke before the age of 60 than people with blood type O (I).

However, more research is needed to discover exactly what causes this connection.

Although scientists assume that different blood groups contribute differently to blood clotting factors.


Recent studies indicate that people with blood type A (II) have a significantly higher risk of developing certain types of stomach cancer.

Also, bacterial infections caused by Helicobacter pylori, which cause stomach ulcers, inflammation and even cancer, occur more often in them than in others.

People with blood types A (II), B (III), and AB (IV) also have a higher risk of pancreatic cancer, cervical cancer, colorectal cancer, breast cancer, and lung cancer.

However, researchers are still not sure why this happens.


Laboratory experiments have shown that mosquitoes prefer blood type O (I).

However, fortunately, it is the presence of the first blood group that helps protect people from the most severe consequences of malaria during treatment.


The tests, which were taken during a large study of European patients, showed that people with blood type O (I) had a slightly lower risk of dying from Covid-19.

If researchers can understand how different blood types affect the risk of developing a particular disease, it will help improve diagnosis and treatment.