This is a very broad topic that covers issues ranging from totally normal through to severe disabilities.  They can be grouped into major categories such as:

• Internal – poor self-esteem, depression, anxiety, & obsession
• External – inattentive, hyperactive, impulsive, oppositional, disruptive
• Processing – difficulty with: reading; speaking; writing; listening; or interpreting nonverbal communication

More specifically, these issues refer to anything that impacts the rate of nerve growth or proper function.  They can be further broken down into classifications based upon:   

1. Which parts of the nervous system are involved
2. What symptoms result from the abnormal nerve function
3. What is causing the learning issue

To read more about how to diagnose the underlying cause, go to:

 Potential Causes and Methods of Diagnosis