The Facts
What Is Dyslexia?
Dyslexia is a learning difference that is inherited and affects a significant portion of the global population. Estimates for the worldwide prevalence of dyslexia symptoms range from approximately 20% of the population. Alarmingly, around 80% of the population are undiagnosed. This means that with a global population of around 8.39 billion, an estimated 1.68 billion people worldwide are dyslexic or have some degree of symptoms, though the number of formally diagnosed cases is lower.
1 in 5
people have dyslexia it's the most common learning difference
80%
of people with dyslexia are undiagnosed or misdiagnosed
Hereditary
dyslexia runs in families 50% chance if one parent has it, nearly 100% if both do
Not IQ
dyslexia has nothing to do with intelligence or effort
Key Information
Percentage
The most commonly cited estimate from organizations like the International Dyslexia Association is that up to 20% of the population may have some degree of dyslexia symptoms.
Global Impact
The condition impacts individuals across all languages, cultures, intellectual levels, and backgrounds, indicating its universal nature.
Heritability
Dyslexia has a strong genetic link. If one parent has dyslexia, there is approximately a 50% chance a child will also be affected, and if both parents have it, the probability increases to nearly 100%.
Undiagnosed Cases
A large number of individuals with dyslexia, particularly adults, remain undiagnosed, which contributes to the challenge of getting definitive global statistics.
Not Related to Intelligence
Dyslexia occurs at all levels of intelligence, and many individuals with the condition are incredibly brilliant and creative thinkers.
