According to Healthline, ADD and ADHD are the same condition. ADD stands for attention deficient disorder, whereas ADHD stands for attention deficit hyperactivity disorder. The two terms describe the same disorder, but ADD is considered to be an older term.
ADHD is a common childhood disorder according to Healthline. Children and adults who suffer from the disorder have a hard time paying attention, are fidgety and lose focus very quickly. ADHD can also cause hyperactivity and impulsivity. According to Healthline there are three subtypes of ADHD: predominantly inattentive presentation, predominantly hyperactive-impulsive presentation and combined presentation. Patients who have predominantly inattentive presentation mostly show symptoms of inattention but may not exhibit symptoms of hyperactivity or impulsivity. Patients with predominantly hyperactive-impulsive presentation are able to focus for large periods of time but still have problems with hyperactivity and impulsivity. The combined presentation occurs in patients who show symptoms of inattention, impulsivity and hyperactivity in various stages of severity. In all subtypes, symptoms must be present and documented for six months before they can be diagnosed, states Healthline. Once diagnosed, patients may grow out of their disorder or change subtypes as they grow older. Many children who suffer from ADHD in school grow out of the disorder by the time they reach adulthood.