It's a comprehensive noun. And it's m e ntal.
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DibWhy not A mental illness in the sentence above as we are using singular ILLNESS and not ILLNESSES?Because it is being used in a non-count way. Mental illness is a general category consisting of many illnesses which can be named - eg schizophrenia, many different sorts of phobias, Alzheimer's, post-traumatic stress disorder, bipolar disorders