About 6% of people have dyscalculia. Studies into the causes of dyscalculia are about 30 years behind research into dyslexia. However, it is thought that the lack of number sense that is often common to people with dyscalculia is connected to the function of the left intraparietal sulcus which deals with numbers, and the front lobe, which deals with reasoning. It can therefore be hereditary but also connected to certain developmental conditions like Foetal Alcohol Syndrome.
An estimated 25% of people have maths learning difficulties which can be caused either by other neurodiverse conditions such as dyslexia or external issues such as a traumatic learning experience related to maths or school absence etc. 60% of individuals with dyslexia will have difficulties with maths.