ADHD is known as a brain disorder due to a chemical imbalance in the brain, and is also commonly categorized under 'Mental Health'. But since it is a type of disorder, it's not really a 'sickness' because it can't be cured, just managed and kept under control.
ADHD
ADHD and anxiety disorder
He never had a mental illness. He gradually got hard of hearing till he went totally deaf.
adhd isn't necessarily a "contractible" disease; it is a mental illness. it is not communicable, and most people who have it are born with it. however, some studies suggest that certain people can attain adhd-like symptoms from long term drug abuse.
downs syndrome, ADHD, dyslexia, TB(tuberculosis)
Electroconvulsive therapy-- This type of therapy is used to treat major depression and severe mental illness that does not respond to medications.
clinical means a type of mental illness.
Psychiatrist
A "Physical Illness" is any type of illness that effects the body such as a virus, rash, bacterial infection etc. As opposed to a mental illness that has to do with an illness effecting mental capacity or processing. if this helps anyone there you go
Catatonia or catatonic schizophrenia.
Memory loss, and sometimes bizzare thinking
It depends on the family history and the type of mental illness that you are talking about. Some kinds of mental illness do run in the family and others happen on their own.