Most appear to be caused by chemical imbalances in the brain of various neurotransmitters.
chemical imbalance
Behavior disorders or mental disorders are conditions that affect a person's thoughts, emotions, and behaviors in ways that cause distress or impairment in daily functioning. Examples include depression, anxiety disorders, bipolar disorder, schizophrenia, and attention-deficit/hyperactivity disorder (ADHD). Treatment often involves a combination of therapy, medication, and lifestyle changes.
If retardation is caused by chromosomal or other genetic disorders, it is often apparent from infancy.
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A chemical imbalance in the brain
Primary sleep disorders are distinguished as those that are not caused by other mental disorders, prescription medications, substance abuse, or medical conditions.
Mercury poisoning
Most, if not all, mental illness (as opposed to emotional disorders) is caused by chemical imbalances in the brain, or by structural anomalies.
This depends on the type of psychologist you ask. Many will say a chemical imbalance in the brain, some will say childhood trauma, some might think that it's genetics.
Yes, some mental disorders can contribute to feelings of hostility and aggression. Conditions such as Borderline Personality Disorder, Intermittent Explosive Disorder, and some forms of psychosis can result in increased irritability, anger, and hostility. It's important to seek professional help if experiencing these symptoms to receive an accurate diagnosis and appropriate treatment.
Organic Mental Health problems have an identifiable physical cause; such as in the dementias or some people with brain injury. Functional Mental Health Problems are not due to simple structural abnormalities of the brain. There is no 100% identifiable cause for these illnesses. The jury is still out.
The majority of psychological disorders are thought to be caused by a complex combination of biological, genetic (hereditary), familial, and social factors or biopsychosocial influences.
Mental health problems are usually categorized by behavior disorders associated with them. They can be caused from a variety of reasons but are mostly attributed to a chemical imbalance. SOmething like OCD, refers to obsessive compulsive disorder where the person does compulsive behaviors because they obbsessively think about them.