Do People Have Different Hair Types?
- Fysiobasen
- Oct 15
- 2 min read
Yes – people clearly have different hair types, and the variations are more than cosmetic. Hair type is determined by a combination of genetic, structural, and biological factors. Hair can be straight, wavy, curly, or very tightly coiled, and it differs in thickness, density, strength, and moisture needs. Here we explain why hair types vary, the factors involved, and what this means for hair care and health.
What Determines Your Hair Type?
Several biological factors influence hair type:
Shape of the follicle: Straight hair grows from round follicles, while curly hair grows from oval or flat follicles¹.
Growth angle: Straight hair grows directly upward, while curly hair emerges at an angle, shaping the strands.
Genetics: Your DNA from both parents plays a key role, with multiple genes influencing texture and curl pattern².
Ethnic variation: Populations differ genetically – people of African descent often have tightly coiled hair, while Asian populations often have straight, coarse hair.
The Four Main Hair Types
Hair is commonly categorized into four groups:
Type 1: Straight hair – Smooth, shiny, and often oily since sebum spreads easily along the strand.
Type 2: Wavy hair – Naturally wavy, ranging from loose to defined waves.
Type 3: Curly hair – Defined curls, from loose spirals to tight ringlets.
Type 4: Coily/kinky hair – Very tight curls or zigzag patterns, often with a more fragile structure³.
Each type also includes subtypes that further define texture and care needs.
How Hair Type Affects Hair Care
Different hair types require tailored care:
Straight hair may need volumizing products to prevent flatness.
Wavy hair often benefits from lightweight hydration that avoids heaviness.
Curly hair needs deep moisture and curl-defining products to reduce frizz.
Coily hair requires intensive hydration, gentle handling, and protective styles to prevent breakage⁴.
Effect: Matching care routines to your hair type helps maintain strength, hydration, and health.
Can Hair Type Change Over Time?
Yes, hair type can change during life due to:
Hormonal shifts such as puberty, pregnancy, or menopause.
Aging, which can thin hair or alter texture.
Damage from heat styling, chemicals, or sun exposure, which may temporarily or permanently affect structure.
Effect: While genetics set the foundation, lifestyle and biology can alter how your hair looks and feels.
Summary – Everyone Has Unique Hair
Hair types vary widely, and each comes with distinct characteristics and needs. Understanding your own hair type makes it easier to choose the right products and care strategies. Hair is not just about genetics – it also reflects health, lifestyle, and culture.
Sources
Randall VA. (2005). Physiology of the hair follicle. Journal of Investigative Dermatology Symposium Proceedings.
Medland SE, et al. (2009). Common genetic influences on head hair curliness. American Journal of Human Biology.
Loussouarn G, et al. (2007). Worldwide diversity of hair curliness: a new method of assessment. International Journal of Dermatology.
Khumalo NP, et al. (2000). African hair morphology: macrostructure to ultrastructure. International Journal of Dermatology.
