Question: I hope it's ok if I ask 2 questions in 1 message.
  
  1. Are ADHD and ADD causes by the same thing? I have ADD but I always _feel_ hyperactive, I just don't act it.
  
  2. Can ADHD of any form be _caused_ by any other mental illnesses, I have a plethora of diagnosed mental health issues and possibly more undiagnosed ones (but obviously I wouldn't know about those) so I'm just wondering
Answer: ADD is no longer a recognized medical or psychological term although it is used informally to refer to primarily inattentive ADHD.  The causes for ADHD with and without hyperactivity are the same.
  
  Over the past two decades, we've come to realize that psych disorders tend to co-occur.  If a patient has ADHD they are likely to also have other disorders.  In many cases that is because two disorders share genetic and environmental risk factors.  In some cases, it is possible that one disorder causes another (e.g., a person becomes depressed because of the life problems created by their ADHD) but we need more research to clarify causal links.
content: Q: I hope it's ok if I ask 2 questions in 1 message.
  
  1. Are ADHD and ADD causes by the same thing? I have ADD but I always _feel_ hyperactive, I just don't act it.
  
  2. Can ADHD of any form be _caused_ by any other mental illnesses, I have a plethora of diagnosed mental health issues and possibly more undiagnosed ones (but obviously I wouldn't know about those) so I'm just wondering
   Ans: ADD is no longer a recognized medical or psychological term although it is used informally to refer to primarily inattentive ADHD.  The causes for ADHD with and without hyperactivity are the same.
  
  Over the past two decades, we've come to realize that psych disorders tend to co-occur.  If a patient has ADHD they are likely to also have other disorders.  In many cases that is because two disorders share genetic and environmental risk factors.  In some cases, it is possible that one disorder causes another (e.g., a person becomes depressed because of the life problems created by their ADHD) but we need more research to clarify causal links.