Of any kind? There are 8 main categories of mental illness:
1) Anxiety Disorders: so feelings of fear and dread to a object or situation (eg social anxiety disorder and generalized anxiety disorder).
2) Mood Disorders: Persistent feelings of sadness/happiness or fluctuations of extreme emotion (eg. Depression and bipolar disorder).
3) Psychotic Disorders: Distorted awareness and thinking like hallucinations (eg. Schizophrenia and Paraphrenia)
4) Eating Disorders: Extreme emotions, attitudes and behaviour in relation to weight and food (eg. Anorexia nervosa and binge eating disorder)
5) Impulse control and addiction disorders: Inability to resist urges that can be harmful to person. (eg. Pyromania and Kleptomania)
6) Personality Disorders: Extreme and inflexible personality traits that cause them or others problems (eg. Antisocial personality disorder and paranoid personality disorder)
6. Obsessive-compulsive disorder (OCD): Constant thoughts or fears about a ritual or routine.
7. Post-traumatic stress disorder (PTSD): Frightening thoughts/memories of the original event and possible emotional numbness.
I hope that helps.
