What is the difference between ADHD and ADD?

ADHD includes the symptom of physical hyperactivity or excessive restlessness–that's the “H”. In ADD (or what is called in the diagnostic manual, ADHD, inattentive subtype), the symptom of hyperactivity is absent. Indeed, people with ADD can be calm and serene, not in the least hyperactive or disruptive.

People with AD/HD (Especially boys) have more energy to put to use, which is what the "H" in AD/HD is, Hyperactivity. ADD on the other hand does not have that.

ADD is when you are very hyperactive but only inside your head it feels like there are constantly thoughts bouncing around and most of the time cant focus on any of them ADD is more common with woman while ADHD more with man. ADHD is more often diagnosed in early stages because people can notice it very quick, they act very hyper while people with ADD are more dreamly into their own thoughts etc.

ADD: Attention Deficit Disorder This diagnosis can sometimes be given falsely to young kids since it is based on attention span and often that doesn't develop for some time in children ADHD: Attention Deficit Hyperactive Disorder Where a person not only has a short attention span but much energy almost to a jittery point

It is important to establish that ADD and ADHD are two distinct disorders and these two should not be used interchangeably as they usually are. About the medical difference in the two and how they differ from each other, refer to this article written specifically on this subject: https://mangoclinic.com/add-vs-adhd-whats-the-difference/ In the 1800s, medical practitioners had not come up with any of the two terms and referred to patients exhibiting their symptoms as nervous or hyperexcitable. This changed when the Diagnostic and Statistical Manual of Mental Disorders, known as the DMS, published its third edition. The official name for this condition is attention deficit disorder (ADD). In this version, the DSM did not consider hyperactivity as a frequent symptom. Two subtypes of ADD were also recognized. The two were ADD with no hyperactivity and ADD with hyperactivity. Revisions in the third edition of the DMS changed the term ADD to attention deficit hyperactivity disorder (ADHD).

As per my knowledge, ADHD is when the hyperactivity shown clearly and it was believed that usually grownups over grow the hyperactivity. However recent studies suggested that grownups with ADHD may not overgrow it hence ADD (Attention Deficit Disorder). Although we don't run around or jump around anymore, our mind is still hyper active. ADHD brain is like a non stop racing car, it runs fast and may go in a circuit track. It needs a lot of mindful training to press the brake, put the car into a stop to pay attention, to be mindful with things. It will need strategies to go back to some points to finish what should be done in those points.