Is Blood Type Personality Real?

Updated October 6, 2022 by BetterHelp Editorial Team

In America, some people look up a potential partner's star sign to see their personality type and compatibility. If you are not too shy to admit it, you may have sought advice on this and relationships from the stars at one time or another. Some people do not rely on the astrological signs of personality information but rather on their biological markers. Continue reading to learn about this unique take on what makes us individuals and see how it may apply to you or someone you know. We will also provide resources for online therapy services if you're interested in diving deeper into self-discovery.

Learn More About The Four Blood Types And Their Associated Personality Traits

In Japanese society, the dating set might ask someone what their blood type is to learn more about them. It may surprise you to learn there is a whole blood type personality theory that has become popularized in Japan.

All You Need To Know About Blood Type Personality

What Is Blood Type Personality?

The concept of blood type personalities might seem foreign to us, yet understanding blood typing is quite popular in certain countries. Some believe that personalitytraits are inherently connected to the type of blood you are born with. Although a potential link between blood type and personality is a fun idea, there's currently no scientific proof to back up blood personality type, meaning the overall theory of blood type personalities is to be viewed as more of a fun myth than a scientific fact.

Similar to how some Americans like to entertain the idea of astrology and horoscopes for fun, some people in Japan enjoy exploring their personality and how it might relate to blood type. One study showed that 99% of Japanese people know their blood types, though it’s important to note that it’s common for many people, regardless of ethnicity, to know their blood type for medical reasons. Nonetheless, the Japan Times has embraced this old, fun theory and has written popular articles on how the primary blood types indicate personality traits.

Read on to learn more about blood type personality traits and what your blood type personality might say about you!

Japanese Professor Tokeji Furukawa Advances Blood Type Personality Theory

The idea of blood type influencing one’s personality isn’t restricted to Japan and may not have even originated there. According to an article in Scientific American magazine, ancient philosophers such as Hippocrates and Aristotle explored the notion of a person’s personality based on different blood types. The article goes on to say that Japanese Professor Tokeji Furukawa chose blood as a physiological characteristic that could be classified according to blood types. His work was the basis for 204 publications by other researchers that discuss the connection between blood types and personality.

There are four primary blood types – A, B, A/B, and O. According to personality theory, the type of blood you have indicates the type of person you are, and the type of blood you have directly correlates to one of four personality types.

Are you curious about your blood type and how it connects to blood typing personality theory? Below, we explore what your blood type might say about you based on current bloody type personality theory. It’s important to note that, again, the below is not backed by consistent data and should be considered more of a fun idea to explore rather than absolute markers of personality or individual identity. Everyone exists on a spectrum, and none of us can be summed up or defined simply by our blood type. As you read this, you are likely to identify with all or multiple of the descriptions to some degree or another regardless of your blood type.


People with blood type A may be clever, passionate, sensitive, and cooperative. They can be loyal and patient, and they love peace. Sometimes, they may be overly sensitive about different things as compared with other blood types. For instance, they might care a lot about etiquette as well as social standards. According to blood type personality theory, A-personalities do not like to break the set rules on etiquette or the societal standards or rules that have been laid down. On occasions where they choose to break the rules, it’s considered a self-fulfilling prophecy.

A blood type personalities are considered careful decision-makers, and they can be known to take their time before they can settle on any decision. Moreover, they are not good at multi-tasking, as they prefer to handle one task at a time. Blood type A people are very organized, and they may not like haphazard actions. These blood type personalities prefer to keep everything neat and in the right place. In fact, they may go to great lengths to keep things neat and tidy. They might plan everything, and every task they engage in is carried out with a lot of consistency and seriousness. Many people with OCD fall may into this category and may benefit from seeking help from a professional counselor who can help with overcoming obsessive-compulsive behaviors, if desired.

People in this blood type category may be very stubborn and easily stressed. They may have higher levels of the stress hormone cortisol, and this makes them intense. They do not like fights and prefer to be in harmony with everyone, and they like to work in collaboration with others in the community. They tend to keep to themselves more so when they do not want to their ideas or opinions. Some of the most common traits of blood type A are as follows – blood type A people are kind, shy, stubborn, attentive, composed, polite, tense, withdrawn, reliable, perfectionistic, sensitive, responsible, tactful, timid, mild-mannered, anxious, earnest, reserved, and polite. As friends, people with type A are considered very reliable and trustworthy. If you are in trouble, you can rely on friends with this blood type. They may not like to show their emotions; they keep their thoughts or feeling about things hidden from others, and they only when comfortable. Famous people with blood type A are George Bush, Jet Li, Britney Spears, and Richard Nixon.


People with this blood type may be more likely to be creative individuals. Individuals who have B blood may make their decisions very quickly, and they are not good at taking orders. When type B blood people focus on something, they put their all into it, and they are unlikely to let go, even if the goal is unachievable or impractical. People with this blood type can have a very strong drive or desire to be the best at anything that they have set their minds to do. Nevertheless, according to blood type personality theory, people with this blood type are poor at multitasking. They are likely to neglect other important tasks and put all their focus on whatever they have set their mind on at the moment.

Learn More About The Four Blood Types And Their Associated Personality Traits

B blood type people might face a lot of discrimination because of their potential negative personality traits, such as a possible tendency to be more selfish or uncooperative and stubborn at times. Society mainly focuses on the negative side of people with blood type B, even though people with this blood type (like any person) have many good qualities, too. As a result, they may tend to be loners, and may isolate themselves from others more so than other blood types. Blood type personality theory states that they may tend to approach things at their own pace. Some of the most common positive traits of people with blood type B include curiosity, relaxed, strong, adventurous, creative, passionate, active, outgoing, and cheerful. On the other hand, the negative traits can include being “wild,” erratic, unforgiving, selfish, uncooperative, irresponsible, and unpredictable. Bs are generally a balance of As and Os, as they are both thoughtful and ambitious. Famous people with type B are Vince Young, Leonardo DiCaprio, and Jack Nicholson. People with blood type B are more compatible with fellow blood type Bs, but they can also relate well with blood type ABs.


Blood type AB, based on the theory, is a mix of A and B personality types. People consider AB people complicated and double-sided. For instance, they can be outgoing just like Bs but may also be shy. At times, people view this blood type as having doublepersonalities, and they keep their true personalities from strangers. It is hard for a stranger to instantly decide which personality people with type AB have until they get to know them. People with this blood type are considered the rarest in the world. AB blood type people are empathetic, and they are likely to be careful when dealing with others. They make sure that they consider other people's points of view. These people have exceptional logical and analytical skills, and they are seen as humanists.

Some of AB’s blood type’s good traits can include being caring, charming, controlled, dependable, cool, composed, sociable, dream chaser, trustworthy, rational, creative, adaptable, and diplomatic. Their negative traits can include being self-centered, irresponsible, vulnerable, indecisive, forgetful, unforgiving, and critical. Famous people with AB are Barack Obama, Marilyn Monroe, Jackie Chan, and John F. Kennedy.


People with blood type O are considered to be outgoing, go-getters, and daring. Blood type personality theory states that they usually set high standards for themselves, and they do all they can to achieve them. Blood type Os have excellent leadership capabilities. Little things do not concern them, and this may make them appear selfish to people in blood group A who may be overly sensitive. Some of the positive personality traits in people with blood type O are: leadership ability, self-determined, easygoing, optimistic, calmness, confidence, outgoing, loyal, cautious, passionate, peaceful, resilient, independent, trendsetter, reliable, carefree, and devoted. On the negative, they are also jealous, rude, ruthless, insensitive, unpunctual, unpredictable, cold, self-centered, workaholics, and arrogant. Individuals with blood type O are very enduring and strong, and that is why the Japanese call them warriors. They are honest people and hate people who tell a lie or hide the truth. People who are O are not overly cautious about small details, as they tend to focus more on the big picture. Famous people with blood type O are such as Queen Elizabeth II, Paul Newman, Elvis Presley, Ronald Regan, John Gotti, and Gerald Ford.

Here is an easy reference guide for making compatibility decisions based on blood type theory:

Medical Concerns Regarding Blood Typing

While blood typing has been somewhat studied as a form of social psychology, scientific research and peer reviewed studies have primarily explored how blood type and the immune system works in connection with diseases such as cardiac disease and stomach cancer. Blood typing may help identify an increased risk of heart disease depending on a person’s blood type. Heart disease is particularly concerning for pregnant women who may have weaker immune systems depending on their blood types. Furthermore, various blood types have also been connected to an increased risk of stomach cancer. The number of a person’s red blood cells is directly related to the strength of a person’s immunity against bacteria and infections. New research shows that red blood cells are immune sensors in our bodies which could be a clue for diagnosing infections in critically ill people.

In pregnant women, the heart has to work harder, causing stress to the heart and blood vessels. There is an increase in blood volume and cardiac output which increases a pregnant woman’s heart rate. At the same time, blood pressure can decrease during pregnancy, causing a pregnant woman to feel short of breath and light-headed. According to the Harvard School of Public Health, women who have blood types A, B, or AB have an increased risk of cardiac disease. In relation to cancer and blood typing, one study found that people with type A blood had an increased risk of stomach cancer while people with type O blood had a slightly decreased risk of stomach cancer. The reason is that people with blood type A are more prone to H. pylori infections.

Regardless of your blood type, whenever you have a serious physical condition, it can impact your mental health. If this occurs, a licensed therapist can help you cope with trying times.

Pregnancy Hypertension: An International Journal of Women's Cardiovascular Health

Blood Type Personality Conclusion

Final Thoughts And Things To Consider

Blood type personality theory is a fascinating topic that can make for interesting discussions in any circle. That said, personalities aren’t always easy to understand. If you’re struggling to understand your own personality or the personality of someone you care about, a licensed therapist can help you sort things out. If you're interested in learning more about yourself to improve, therapy is a great option. BetterHelp offers convenient and confidential therapy at an affordable price.

Start therapy online today.

Below are some commonly asked questions about blood type personality:
Which blood type has the best personality?
What is the personality of type A blood?
What blood type is common among psychopaths?
Which blood type is smart?
What is the strongest blood type?
Which blood group should not marry?
Is blood type A+ good?
Can O and A+ have babies?
What is the best blood type in Japan?
Which blood Cannot have babies?

Learn More About It

If you're interested in exploring potential links between your own blood type and personality, therapy may be a good place to start. Therapy is a personal experience, and not everyone will go into it seeking the same things. Keeping this in mind can ensure that you will get the most out of online therapy for blood type or blood personality type, regardless of what your specific goals are. If you’re still wondering if therapy for blood type analysis is right for you, and how much therapy costs, please contact us at BetterHelp specializes in online therapy to help address all kinds of mental health concerns. If you’re interested in individual therapy, please reach out to

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