Cotard's Syndrome or Walking Corpse Syndrome.
It seems unlikely that many atheists think about such things! But, atheism isn't considered a mental disorder.
There are so many . . . I can think of bipolar disorder, depression, disassociation disorder, panic disorder, personality disorder, asocial disorder among the many.
Yes schizophrenia is a mental disorder and can be very damaging towards your brain. If you think you might have it, consult your doctor about it, and he may go along with it taking you to a psychiatrist.
Anorexia nervosa is indeed a mental disorder.
shes coocko for cocoa cocoa puffs and she likes dead fathers
Liberalism Is a Mental Disorder has 221 pages.
A hypochondriac
A mental disorder is defined by psychological symptoms some of which are called psychopathological phenomena.
Mental? Yes. Disorder? Sounds like a strong term. How about "condition".
Do you mean "mental" disorder?
An addiction disorder
According to the Diagnostic and Statistical Manual of Mental Disorders, phobias are considered to be sub-types of anxiety disorder (psychiatric disorder).