I have 3 friends that told me they have been diagnosed with a mental illness. 2 of them suffer from depression and anxiety. The third one has obsessive-compulsive disorder. If these are mental illnesses, then it seems like we are all mentally ill.
In your opinion, is having a mental illness, the same thing as having a severe mental health issue?
That's a semantic thing, no, for most of us. A severe mental issue sounds to me like something incurable. An illness seems to have a chance for a cure.