Sheldon’s Somatotypes and Hippocrates’ Humoral Theory Made Easy

Why are some people naturally energetic and bold, while others are calm or shy?
Long before personality tests and questionnaires existed, psychologists and philosophers tried to answer this question by looking at the body itself.

Two of the earliest and most influential approaches were:

The Humoral Theory of Personality – proposed by Hippocrates and expanded by Galen, and
Sheldon’s Somatotype Theory – developed in the 1940s by William Herbert Sheldon.

Both linked physical traits to psychological tendencies, shaping how early psychology understood personality.

The Humoral Theory of Personality – The Ancient Roots

Origin:

Around 400 BCE, the Greek physician Hippocrates believed that the human body contained four bodily fluids (humours):

Blood
Yellow bile
Black bile
Phlegm

Later, Roman physician Galen (2nd century CE) expanded this idea to explain temperament – our emotional style and behavioural pattern.

The Four Humors and Temperaments

Humor	Dominant Organ	Temperament Type	Key Traits
Blood	Heart	Sanguine	Cheerful, sociable, optimistic, active
Yellow bile	Liver	Choleric	Ambitious, leader-like, easily angered
Black bile	Spleen	Melancholic	Thoughtful, sensitive, perfectionist
Phlegm	Brain/Lungs	Phlegmatic	Calm, reliable, peaceful, slow to react

The Core Idea

When these four humors were balanced, a person was healthy and emotionally stable.
When one dominated, it shaped both personality and health.

For example:

Too much blood → lively and outgoing (Sanguine)
Too much black bile → sad or overthinking (Melancholic)

Relevance

Though outdated medically, the humoral theory was the foundation for modern temperament and personality psychology.
Even today, we use terms like “melancholic” or “choleric” echoes of this ancient system!

Sheldon’s Somatotype Theory – Body Builds and Behaviour

Background

In the 1940s, William H. Sheldon, an American psychologist, proposed that body structure (physique) is linked to personality.
He classified people into three body types, or somatotypes, and found patterns of temperament linked to each.

The Three Somatotypes

Somatotype	Physical Traits	Personality Characteristics
Endomorph	Round, soft body, higher fat proportion	Sociable, relaxed, comfort-loving (Viscerotonic temperament)
Mesomorph	Muscular, strong, well-built	Energetic, assertive, bold (Somatotonic temperament)
Ectomorph	Thin, delicate, tall	Introverted, sensitive, thoughtful (Cerebrotonic temperament)

Explanation

Sheldon believed that our biological build influences our behavioural tendencies:

Endomorphs enjoy comfort, social contact, and food.
Mesomorphs seek activity, adventure, and dominance.
Ectomorphs prefer solitude, ideas, and creativity.

He even developed a rating scale (1–7) to describe where someone falls on each body dimension, suggesting that most people are a mix, not a pure type.

Relevance Today

While Sheldon’s theory has been criticised for being too biological and stereotype-based, it remains historically significant.
Modern research agrees that biology and personality are connected, but in more complex ways involving genetics, hormones, and brain structures, not just body shape.

Sheldon’s ideas inspired the study of biopsychological personality theories, bridging body and mind, and leading to modern fields like health psychology and psychobiology.

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MCQs on Sheldon and Humoral Theories

1. The idea of four bodily humors influencing personality was first proposed by:
a) Galen
b) Hippocrates
c) William Sheldon
d) Sigmund Freud

2. According to Galen, a person dominated by black bile would be:
a) Cheerful and lively
b) Calm and peaceful
c) Sad and thoughtful
d) Angry and aggressive

3. Sheldon’s Somatotype Theory classifies people based on:
a) Blood type
b) Body structure
c) Intelligence
d) Emotional state

4. Which somatotype is associated with being muscular and assertive?
a) Endomorph
b) Ectomorph
c) Mesomorph
d) Phlegmatic

5. The temperament associated with an endomorphic body type is called:
a) Cerebrotonic
b) Viscerotonic
c) Somatotonic
d) Melancholic

6. The term sanguine refers to which bodily humor?
a) Phlegm
b) Blood
c) Yellow bile
d) Black bile

7. Who expanded Hippocrates’ theory of humors into four distinct temperaments?
a) Plato
b) Aristotle
c) Galen
d) Sheldon

8. The cerebrotonic temperament is linked with which somatotype?
a) Mesomorph
b) Endomorph
c) Ectomorph
d) Sanguine

9. Which of the following correctly matches the pair?
a) Choleric – Calm and peaceful
b) Sanguine – Sociable and lively
c) Melancholic – Aggressive and bold
d) Phlegmatic – Impatient and competitive

10. A major criticism of Sheldon’s Somatotype Theory is that:
a) It ignores environmental factors
b) It lacks any biological basis
c) It overemphasises intelligence
d) It has too many personality categories