Can You Change Your IQ? What the Research Actually Shows

Your IQ score can shift, but not the way most people think

Your IQ can change, but the change is usually small and depends on what you mean by "change." If you mean raising your score by 20 or 30 points through effort alone, the research does not support that. If you mean modest improvements in specific skills that feed into IQ tests — like processing speed, working memory, or pattern recognition — those are real and measurable.

The gap between these two things matters because it shapes what you can actually do. A child's IQ can shift more than an adult's, especially before age 18. Brain injuries, illness, or major life stress can lower it. Intensive training on specific mental tasks can improve performance on those exact tasks, though the improvement often does not transfer to other areas. And straightforward retaking a test usually produces a higher score the second time, even without any real change in ability.

Key Takeaways

• IQ scores are more stable in adults than children, but small shifts of 5 to 10 points happen naturally over time and are not unusual.
• Targeted practice on specific skills — like working memory exercises or pattern puzzles — can improve performance on those skills, but gains rarely transfer to overall IQ.
• Brain development, sleep, nutrition, and stress all affect how you perform on an IQ test, so your score on any given day reflects more than just your fixed ability.
• Retaking an IQ test usually produces a higher score the second time because you are familiar with the format, even if your underlying ability has not changed.
• IQ is one measure of certain mental abilities, not a measure of intelligence, potential, or worth — and it does not predict success in most real-world situations as well as motivation and opportunity do.

Why IQ scores shift naturally over time

IQ tests measure performance on a specific day under specific conditions. Your score depends on sleep the night before, stress level, nutrition, how familiar you are with the test format, and how hard you try. A person who is hungry, anxious, or sleep-deprived will score lower than the same person well-rested and calm. None of these changes reflect a change in underlying ability.

Children's IQ scores are less stable than adults' because their brains are still developing. A child's score at age 8 is a weaker predictor of their score at age 16 than an adult's score at 30 is of their score at 40. This is normal development, not improvement or decline. By early adulthood, IQ scores tend to stabilize, though small shifts continue throughout life.

Aging also affects IQ in specific ways. Fluid intelligence — the ability to solve novel problems quickly — tends to decline slightly with age. Crystallized intelligence — knowledge and skills built up over time — tends to stay stable or improve. So an older adult might score lower on a timed pattern-recognition test but higher on a vocabulary test.

What training can and cannot do

Brain training games and working memory exercises do improve performance on those specific tasks. If you practice pattern puzzles, you get better at pattern puzzles. If you do working memory drills, your working memory on those drills improves. The problem is that this improvement rarely transfers to other tasks or to overall IQ scores.

A person who spends months on brain training apps might see their score on those apps rise significantly. But when they take a full IQ test that includes different types of problems, the overall score may not change much. The brain appears to get better at the specific task you practice, not at the general ability the task measures.

This does not mean training is useless. If you need to improve at a specific skill — like mental math, reading speed, or spatial reasoning — targeted practice works. But if your goal is to raise your IQ score itself, the research shows that approach has limits. The gains are usually small, task-specific, and fade if you stop practicing.

How brain development, injury, and illness affect IQ

Major changes to IQ usually come from events that affect the brain itself, not from effort or practice. A serious head injury, stroke, or illness like encephalitis can lower IQ significantly. Untreated sleep apnea, severe malnutrition, or chronic stress can depress scores. These are real changes in brain function, not just test performance.

On the other side, treating an underlying condition can raise IQ. A child with undiagnosed hearing loss who gets hearing aids may show a jump in IQ score because they can now process language properly. A person whose thyroid disorder is treated may see improvement. These are not changes in ability created by the treatment — they are the removal of obstacles that were suppressing performance.

Education and learning also matter, but in a specific way. Schooling does not raise IQ much, but it does build the knowledge and skills that IQ tests measure. A child who attends school regularly will likely score higher than an identical child who does not, even if their underlying cognitive ability is the same. The test measures what you know and can do, not just raw potential.

The difference between IQ and intelligence

IQ measures performance on a narrow set of tasks: pattern recognition, vocabulary, spatial reasoning, processing speed, and working memory. It does not measure creativity, emotional intelligence, practical problem-solving, persistence, or the ability to learn from experience. Many people with average IQ scores are highly successful; many with high IQ scores are not.

IQ is also culturally bound. Tests are written in a specific language, assume familiarity with certain types of problems, and are timed in ways that favor some people over others. A person who grew up in a different culture or educational system may score lower on a standard IQ test without any difference in actual cognitive ability. The test measures how well you match a particular pattern of thinking, not how smart you are.

This matters because it means your IQ score is not a fixed label on your worth or potential. It is a snapshot of how you performed on one type of task on one day. You can improve at specific skills, learn new things, and develop abilities that matter far more to your life than an IQ number does.

What actually predicts success and learning ability

In school and work, motivation, persistence, and opportunity predict outcomes better than IQ does. A person with an average IQ who works hard, asks for help, and stays focused will usually outperform someone with a high IQ who gives up easily. This is not because IQ does not matter — it does — but because it is only one factor among many.

The ability to learn new skills improves with practice, feedback, and time. You can get better at almost anything if you practice deliberately — that is, with focus on the parts you struggle with, not just repetition of what you already do well. This kind of improvement is real and often dramatic, even if it does not show up as a higher IQ score.

Your environment also shapes what you can do. Access to good schools, stable housing, nutrition, sleep, and people who believe in you all affect how well you perform on tests and in life. These are not measures of intelligence — they are measures of opportunity. Two people with identical IQ scores can have very different outcomes depending on their circumstances.

Retesting and why scores go up the second time

If you take an IQ test twice, your score on the second test is usually higher than the first, even if your ability has not changed. This is called the practice effect. You are familiar with the format, you know what to expect, and you are less anxious. All of these things improve performance.

This is why IQ tests are usually given only once or twice in a person's life, and why the time between tests matters. If you retake a test within a few weeks, the practice effect is large — your score might jump 5 to 15 points. If you retake it after several years, the effect is smaller. Psychologists account for this when they interpret scores, but it is important to know that a higher score on a retest does not necessarily mean your ability improved.

Frequently Asked Questions

Can you raise your IQ by 10 or 20 points?

Small shifts of 5 to 10 points happen naturally and are not unusual. Raising it by 20 points through effort alone is not supported by research. You can improve at specific skills that feed into IQ tests, but those gains are usually task-specific and do not transfer to overall IQ.

Does brain training actually work?

Brain training improves performance on the specific tasks you practice. If you do working memory drills, your working memory on those drills improves. But research shows this improvement rarely transfers to other tasks or to overall IQ scores. The gains are real but narrow.

Can a child's IQ change more than an adult's?

Yes. Children's IQ scores are less stable because their brains are still developing. A child's score at age 8 is a weaker predictor of their score at 16 than an adult's score at 30 is of their score at 40. By early adulthood, scores tend to stabilize.

Does education raise IQ?

Schooling does not raise IQ much, but it builds the knowledge and skills that IQ tests measure. A child who attends school regularly will likely score higher than an identical child who does not, even if their underlying ability is the same. The test measures what you know, not just raw potential.

What matters more than IQ for success?

Motivation, persistence, and opportunity predict outcomes better than IQ in school and work. A person with average IQ who works hard and stays focused usually outperforms someone with high IQ who gives up easily. Environment, access to resources, and people who believe in you also matter greatly.