Mental Illness is also known as ‘Mental Health Disorder’ that affects the mood, thinking and behavior. Examples of mental illness includes Anxiety, Depression, Bipolar Affective Disorder, Schizophrenia, Substance Abuse and Withdrawal, Dementia and Alzheimer’s Disease. A mental health problem becomes a mental illness when a person is unable to function under stress. A mental illness causes you to have problems in your daily life, school and work.