Picture four people standing in a long queue at the post office. One is shifting impatiently, loudly complaining about how slow the service is. Another has put on a podcast and barely notices the wait. A third is wondering whether they came on the wrong day entirely, a knot of worry tightening in their chest. And the fourth strikes up a conversation with the woman beside them, and within five minutes they are both laughing. These four reactions match the four temperaments that Hippocrates described over two thousand years ago.
The oldest personality test in the world
The ancient Greek physician Hippocrates (460-370 BC) proposed that human behavior is shaped by four bodily fluids: blood, yellow bile, black bile, and phlegm. Whichever fluid dominated would determine how a person acted. Several centuries later, the Roman physician Galen (129-216 AD) expanded the concept and defined four temperaments: sanguine, choleric, melancholic, and phlegmatic.
Does it sound archaic? Absolutely. Nobody today believes your personality depends on the ratio of fluids in your body. But the underlying observation, that people respond to the same situations in strikingly different ways and that these differences remain relatively stable over time, was surprisingly accurate. Accurate enough that the four temperaments keep resurfacing in psychology to this day, in one form or another.
Sanguine: the one who lights up the room
Sanguine people are sociable, optimistic, and full of energy. They walk into a room and immediately connect with someone. They love variety, new experiences, and spontaneity.
Their strengths are contagious. They can motivate, inspire, and energize a team. They are natural communicators. In a meeting, they are the ones who fire off ten ideas in a minute.
The downside? Superficiality. A sanguine person might start ten projects and finish none of them. They get excited easily, but the excitement fades just as fast. They tend to promise more than they deliver, not out of bad faith, but out of a genuine belief that they will "figure it out somehow."
A real-world example: Lucy worked as an event manager, and her sanguine temperament was a perfect fit. Organizing events, meeting new people, every day different. When she was promoted to a role where she spent most of the day buried in spreadsheets and reports, she quit within three months. Not because she could not handle the work. Because it was draining the life out of her.
Choleric: the one who goes after the goal
Choleric people are energetic, decisive, and direct. When something moves too slowly, they speed it up. When they hit an obstacle, they either jump over it or remove it. Often literally.
Choleric types are natural leaders. They shine in crises because they do not panic and they act fast. They are competitive and ambitious. If you need someone who will get things done under pressure, you are looking for a choleric.
But their directness comes at a cost. Choleric people can be intolerant of slower colleagues. Sometimes they steamroll others because it feels more efficient to decide alone than to wait for consensus. And their blunt communication can come across as rude, even when no rudeness is intended.
It is worth noting that choleric types often make excellent entrepreneurs. A study by Zhao and Seibert (2006) compared the personality profiles of entrepreneurs and managers. They found that entrepreneurs score higher on conscientiousness and lower on agreeableness, a combination that maps almost perfectly onto the classic choleric type.
Melancholic: the one who sees the details
If the sanguine sees the big picture and the choleric sees a straight path to the goal, the melancholic sees all the details, potential problems, and nuances that everyone else misses.
Melancholic people are thoughtful, analytical, and meticulous. Their work is carefully considered and high quality. They are sensitive to art, music, and beauty. They often have a rich inner world that others rarely get access to.
But they tend toward perfectionism that can paralyze them. While a sanguine person hands in a "good enough" project on time, the melancholic keeps working on it until the last possible moment because it is "still not perfect." And the sensitivity that makes them so perceptive also makes them more vulnerable to criticism and stress.
You can spot the melancholic on a team because they are the first to flag a risk that everyone else overlooked. That can be annoying, but it often saves the project.
Phlegmatic: the one who stays calm
Phlegmatic people are calm, steady, and reliable. They are the anchor in a stormy sea. While the other temperaments around them are erupting, deciding, and analyzing, the phlegmatic quietly does their work.
Their strength lies in consistency. A phlegmatic person does not need drama or excitement. They can work on routine tasks without losing motivation. They are diplomatic, nonjudgmental, and have a natural ability to defuse tense situations.
The weakness? Passivity. A phlegmatic person may delay decisions, avoid conflict so thoroughly that problems snowball, and settle for a "good enough" outcome even when they could achieve more. They can seem indifferent even when they genuinely care. They just do not show it.
Do you have a colleague who never looks stressed and always meets the deadline? That is probably a phlegmatic. Ask them how they are really feeling. The depth of their answer might surprise you.
Nobody is a pure type
Here is an important point that Galen did not address: a pure sanguine, choleric, melancholic, or phlegmatic person essentially does not exist. Most people are a blend of two or three temperaments, with one being dominant.
This is actually one of the reasons why the old four-type system eventually stopped being enough for psychologists. The world is not simple enough to fit into four boxes. But that does not mean the whole concept is useless.
From temperament to Big Five: what modern science says
When researchers like Lewis Goldberg, Paul Costa, and Robert McCrae developed the Big Five model (also known as the five-factor model of personality) in the 1980s and 1990s, they did not start from ancient Greek theories. They analyzed thousands of adjectives that describe personality and statistically identified five fundamental dimensions: openness, conscientiousness, extraversion, agreeableness, and neuroticism.
Yet there are remarkable parallels between the old temperaments and the Big Five:
| Temperament | Big Five equivalent |
|---|---|
| Sanguine | High extraversion, low neuroticism, higher openness |
| Choleric | Low agreeableness, low neuroticism, higher extraversion |
| Melancholic | High neuroticism, low extraversion, higher conscientiousness |
| Phlegmatic | Low extraversion, low neuroticism, higher agreeableness |
A study by Strelau and Zawadzki (1995) directly tested the relationship between classical temperaments and the Big Five. The correlations were strong and statistically significant. In other words, Hippocrates and Galen intuitively captured something that modern psychometrics later confirmed with far more precise tools.
The difference is in precision. While temperament places you in one of four categories, the Big Five shows your position on five independent scales. The result is a much more detailed map of who you are.
Why temperaments still fascinate us
If we only had the Big Five, would that be enough? From a scientific standpoint, yes. But temperaments have survived for two thousand years for a good reason: they are easy to understand. Say "he is a classic choleric" and everyone immediately pictures a specific kind of behavior. Try the same thing with "high extraversion, low agreeableness, low neuroticism" and you will lose most of the room.
Temperaments work as a shorthand. A quick sketch that does not replace a detailed map, but helps you get your bearings.
There is also the fascinating question of temperament versus personality: what is innate and what is learned? Temperament has traditionally been understood as a biological foundation, what you are born with. Personality, as a broader concept, also includes experience, upbringing, and culture. A meta-analysis by Rothbart and Bates (2006) confirmed that temperament traits visible in infants (reactivity, self-regulation, positive and negative emotionality) do correlate with personality traits in adulthood.
So you are not just the product of how you were raised. But you are not purely the product of your genes, either. You are a combination of both, and that is exactly what makes you unique.
Temperament and career
Let us return to Lucy from the event agency. Her story illustrates something that research confirms again and again: the fit between your temperament (or personality) and your work environment has a major effect on job satisfaction.
- Sanguine types thrive in dynamic, people-facing roles: marketing, PR, sales, creative fields. Routine kills their motivation.
- Choleric types need autonomy and challenge: entrepreneurship, management, crisis response, law. An environment that moves too slowly frustrates them.
- Melancholic types excel in work that demands precision and depth: research, programming, auditing, art, science. They need quiet focus time.
- Phlegmatic types do well in roles that require patience and consistency: administration, counseling, medicine, diplomacy. Too much chaos drains them.
Of course, none of this is an absolute rule. A sanguine person can be an excellent programmer if they work in a team and tackle varied projects. A melancholic person can be a great manager if they lead a team of specialists and the work involves analytical decision-making.
Which temperament are you?
Maybe you recognized yourself in one of the descriptions right away. Maybe you are torn between two. Both are perfectly normal, and as we mentioned, most people are a blend.
If you want to go beyond four types and discover your personality profile with scientific precision, try the Big Five personality test. It will show you where you fall on five independent dimensions that modern psychology considers the most reliable description of personality. And you might find that it confirms what the good old temperaments have been hinting at for years.