TL;DR
Type A personalities are competitive, urgent, and easily irritated; Type B personalities are relaxed, patient, and even-tempered. The framework came from 1950s cardiology, not psychology — two heart doctors noticed their impatient patients had more heart disease. Modern research kept part of the idea (hostility does predict cardiac risk) but discarded most of it: personality is not two boxes. The scientific model, the Big Five (OCEAN), describes you on five continuous sliders instead. In that language, "Type A" is roughly high Conscientiousness plus high Neuroticism, and "Type B" is closer to low Neuroticism. Read on for the full picture — then measure your own.
If you have ever been called "such a Type A" for color-coding your calendar, or shrugged off a missed deadline like a classic "Type B," you have used one of the most durable pop-psychology labels of the last 70 years. The split feels intuitive: driven, wound-up people versus laid-back, go-with-the-flow people.
But where did Type A and Type B actually come from, is the theory real, and which one are you? The honest answers are more interesting than the meme. Below is what the labels capture, what the science says now, and how the A/B split lines up with the Big Five — the continuous, evidence-based model psychologists actually use today.
What is a Type A personality?
A Type A personality is defined by three linked tendencies: a strong competitive drive, a chronic sense of time urgency, and a tendency toward impatience or hostility when things get in the way. Type A people tend to talk fast, walk fast, hate waiting in line, work long hours, and measure themselves against goals and other people.
The classic Type A traits include:
- Competitiveness — a need to win, achieve, and be recognized
- Time urgency — the feeling that there is never enough time; doing two things at once
- Achievement drive — high standards, ambition, self-imposed deadlines
- Impatience and irritability — frustration with delays, slow people, and interruptions
- Hostility — in the original definition, a readiness toward anger and cynicism under pressure
Not all of these are negative. The achievement and drive components look a lot like ambition, and they often come with real accomplishment. The problem the original researchers cared about was the hostile, pressured edge — the part that keeps the stress response switched on.
What is a Type B personality?
A Type B personality is essentially the low end of those same tendencies: relaxed, patient, and steady. Type B people are not lazy or unambitious — the difference is how they pursue goals. They tend to work without a constant sense of the clock, tolerate delays without much frustration, and stay even-tempered under pressure.
The classic Type B traits include:
- Relaxed pacing — comfortable working at a steady rhythm, less driven by urgency
- Patience — waiting, queuing, and setbacks provoke less frustration
- Even temper — slower to anger, less reactive to stress
- Reflection over reaction — more willing to pause before responding
- Enjoyment of the process — less fixated on winning or finishing first
The point the framework was making was never "B is better than A." It was that the hostile, pressured style of pursuing goals — not ambition itself — seemed to carry a health cost.
Where the theory actually came from
Here is the fact most articles skip: Type A/B was not invented by psychologists. It came from cardiology.
In the 1950s, two San Francisco cardiologists, Meyer Friedman and Ray Rosenman, noticed something odd. The chairs in their waiting room were wearing out at the front edges — as if patients were literally sitting on the edge of their seats, ready to leap up. Their heart-disease patients were impatient, hurried, and easily irritated. Friedman and Rosenman named this cluster the Type A Behavior Pattern and its calmer opposite Type B, then ran a large prospective study — the Western Collaborative Group Study — which reported that Type A men developed coronary heart disease at roughly twice the rate of Type B men (Rosenman et al., 1975).
That finding made Type A famous. It also, eventually, got complicated.
Type A/B did not come from a personality lab. It came from two heart doctors noticing their waiting-room chairs were worn out at the front — patients too tense to sit back.
Is Type A personality still considered real science?
Partly. This is where the honest version matters.
The original heart-disease link weakened under scrutiny. Later studies, including some funded by the tobacco industry and several independent replications, failed to reproduce the strong Type A → heart disease effect. A large re-analysis and subsequent meta-analyses found that "Type A" as a whole was a much weaker predictor of cardiac events than the first studies suggested.
What survived is more specific. Researchers decomposed the Type A pattern and found that the hostility and anger component — not the ambition, not the busyness — is the part that actually predicts cardiovascular risk (Chida & Steptoe, 2009). In other words: being driven and busy is not, by itself, bad for your heart. Being chronically hostile and cynical is the real signal.
The part that got quietly dropped
When people say "Type A is bad for your heart," they are repeating a 1970s headline that the field has since narrowed. The modern, defensible claim is much tighter: trait hostility and anger are associated with cardiovascular risk. Ambition, hard work, and a full calendar are not the same thing as hostility — and lumping them together is exactly the imprecision that makes the A/B labels unreliable.
So Type A/B is not fake — it pointed at something real. But as a personality theory, it has a deeper problem: it sorts people into two boxes.
The bigger problem: people are not two types
The core limitation of Type A vs Type B is the same one that sinks most pop-personality systems, including the MBTI: it is categorical when personality is continuous.
Real traits are not on/off. Almost nobody is a pure Type A or a pure Type B. Most people are somewhere in the middle, and on a given day they slide around depending on sleep, stress, and stakes. A binary label forces a spectrum into two bins, throws away all the information in between, and produces the same instability that makes people get different results when they retake a two-box test.
This is why academic psychology moved to a dimensional model — the Big Five, also called OCEAN or the Five-Factor Model. Instead of a type, you get a position on five independent sliders: Openness, Conscientiousness, Extraversion, Agreeableness, and Neuroticism. Nothing is discarded, and the profile is stable enough to predict real-world outcomes years out.
How Type A and Type B map onto the Big Five
Here is the useful part — and the thing most Type A/B articles never do. You can translate the old A/B language into the modern Big Five, and it becomes much more precise. The A/B pattern is not one trait; it is a blend of two.
| Type A/B feature | Big Five translation | Direction |
|---|---|---|
| Achievement drive, hard work, deadlines | Conscientiousness | High |
| Time urgency, impatience, irritability | Neuroticism | High |
| Hostility, anger, cynicism | Neuroticism + low Agreeableness | High N, low A |
| Relaxed pacing, even temper (Type B) | Neuroticism | Low |
| Patience, tolerance of delay | Neuroticism (low) + Agreeableness | Low N, higher A |
Read the table and the fog clears. A "classic Type A" is roughly high Conscientiousness combined with high Neuroticism — the ambitious, organized achiever whose drive comes wrapped in time-pressure and irritability. A "classic Type B" is closer to low Neuroticism — calm and unhurried — regardless of how ambitious they are.
That decomposition also explains the health story. It is not "Type A" that predicts cardiac risk; it is the high-Neuroticism, low-Agreeableness (hostility) piece. A person who is high in Conscientiousness but low in Neuroticism — driven but not anxious or hostile — is the productive, resilient profile that the crude "Type A" label completely fails to distinguish from the stressed-out version.
Why this matters for you
If you have always identified as "Type A," the Big Five can tell you which part of that is true. Are you high-Conscientiousness (the healthy, productive engine) or high-Neuroticism (the stressed, urgent edge) — or both? Those are very different profiles with very different implications, and a two-box label can't separate them. A Big Five test can.
So which one are you?
You can probably feel your lean already — most people can. But "Type A or B" is the wrong question, because it forces a single answer to what are really two separate questions:
- How driven and organized are you? (Conscientiousness)
- How reactive to stress and pressure are you? (Neuroticism)
Someone high on the first and low on the second is a calm high-achiever — arguably the best of both worlds, and invisible to the A/B framework. Someone low on the first and high on the second is neither a "Type A go-getter" nor a "relaxed Type B" — they are anxious and unhurried, which the binary can't represent at all.
In our own anonymized test data, a large share of people who would self-describe as "Type A" actually split into two distinct Big Five profiles once you measure them — the driven-and-calm group and the driven-and-stressed group. Same label, different people, different advice. That split is the entire argument for measuring instead of labeling.
Frequently asked questions
The bottom line
Type A vs Type B is a useful piece of shorthand and a genuinely interesting bit of medical history — but it is 70-year-old shorthand. It sorts a continuous reality into two bins, blends together traits that behave very differently, and repeats a heart-disease claim the field has since tightened.
If you want to know what "Type A" actually means for you, don't pick a box. Measure the underlying dimensions. Are you driven, stressed, both, or neither? That is a two-number answer, not a one-letter one.
Find out what's really behind your 'Type A'
The free Big Five test scores you on Conscientiousness and Neuroticism — the two dimensions that make up the old Type A/B split — plus three more. About 7 minutes, no signup.
To go deeper, read what the Big Five is, see how it compares to the MBTI, or explore the two traits behind the A/B split directly: Conscientiousness and Neuroticism.
Sources
Rosenman, R. H., Brand, R. J., Jenkins, C. D., Friedman, M., Straus, R., & Wurm, M. (1975). Coronary heart disease in the Western Collaborative Group Study: Final follow-up experience of 8½ years. JAMA, 233(8), 872–877. — The original prospective study linking the Type A pattern to coronary heart disease.
Chida, Y., & Steptoe, A. (2009). The association of anger and hostility with future coronary heart disease: A meta-analytic review of prospective evidence. Journal of the American College of Cardiology, 53(11), 936–946. — Shows the hostility component, not the whole Type A pattern, carries the cardiac risk.
Myrtek, M. (2001). Meta-analyses of prospective studies on coronary heart disease, Type A personality, and hostility. International Journal of Cardiology, 79(2–3), 245–251. — Finds the overall Type A construct is a weak predictor, unlike hostility.
Costa, P. T., & McCrae, R. R. (2008). The Revised NEO Personality Inventory (NEO-PI-R). In The SAGE Handbook of Personality Theory and Assessment. — Reference for the Big Five dimensions used to reinterpret the A/B pattern.
Roberts, B. W., Walton, K. E., & Viechtbauer, W. (2006). Patterns of mean-level change in personality traits across the life course: A meta-analysis of longitudinal studies. Psychological Bulletin, 132(1), 1–25. — Evidence that Big Five traits are stable yet continuous, unlike categorical types.
