What factors can cause mental illness?!
1. Genetics; I don't believe any specific genes have been isolated, but heredity is strongly suspected because research shows high incidence of mental illness running in families, and identical twins are move likely to have the same mental illness.
2. Environment/Situation; Could be extreme stress, enduring a traumatic event such as physical/sexual abuse or witnessing death/violence in a war, accident or disaster. Many people with severe illness or disabling condition become very depressed because they have a difficult time dealing with it.
3. Physical Condition or Illness: A head injury or neurological disease such as encephalitis (brain infection) could cause mental illness. Dementia is caused by physical changes to the brain. Certain diseases maybe have an indirect effect on the brain/nervous system and contribute to mental illness; thyroid disorder, multiple sclerosis, lupus, etc. If a pregnant woman drinks alcohol or uses drugs such as cocaine it can have permanent effects on the baby's mental and physical health.
4. Drug abuse/dependence: A drug can make physiological changes in the brain which are sometimes permanent.
Also, more than one of the four categories could be involved in a particular individual. For example; I have read the histories of a lot of people with schizophrenia or bipolar disorder who came from an abusive or otherwise inappropriate family environment.
Mental disorder or mental illness are terms used to refer to a psychological or physiological pattern that occurs in an individual and is usually associated with distress or disability that is not expected as part of normal development or culture. The recognition and understanding of mental disorders has changed over time. Definitions, assessments, and classifications of mental disorders can vary, but guideline criterion listed in the ICD, DSM and other manuals are widely accepted by mental health professionals. Categories of diagnoses in these schemes may include mood disorders, anxiety disorders, psychotic disorders, eating disorders, developmental disorders, personality disorders, and many other categories. In many cases there is no single accepted or consistent cause of mental disorders, although they are widely understood in terms of a diathesis-stress model and biopsychosocial model. Mental disorders have been found to be common, with over a third of people in most countries reporting sufficient criteria at some point in their life. Mental health services may be based in hospitals or in the community. Mental health professionals diagnose individuals using different methodologies, often relying on case history and interview. Psychotherapy and psychiatric medication are two major treatment options, as well as supportive interventions. Treatment may be involuntary where legislation allows. A number of movements campaign for changes to mental health services and attitudes, including the Consumer/Survivor Movement. There are widespread problems with stigma and discrimination.Mental illness also occurs if a person being criticized by friends all the times,and have no friends.
Usually mental illnesses are by birth, they're genetic or some experiences cause them.
Many factors can cause or contriubute to mental illness. Genetic predisposition, enviroment, social, cultural and economic stresses, trauma such as that caused by abuse or war, illness, drugs, grief, abnormalities or malfunctions within the brain or chemical imbalances. These are just a few things but there are many and often several factors will come into play.