OCD is a mental disability so it affects the brain.
Sometimes depression can be a part of it, I have borderline OCD. Usually axiety is the number one cause of OCD.
Every part of the body is vulnerable
Quite significantly as that body part is no longer there.
Lung
eyes
Eye
the head
Bones
Tongue
the left side of your head
Depressants slow (or depress) the functioning of the entire body.
some patients with severe cases of obsessive-compulsive disorder (OCD) have been helped by an operation on a part of the brain that is involved in OCD.