a feeling of apprehension or worry about something bad happening in the future.

Occurs when a person's mental health problems are brought about by drug use.

describes all chemicals, substances, and medicines that change the way that people feel, behave or think.

When a person perceives something that does not exist.

These drugs energize the nervous system by making the nerves act more quickly than normal.

beliefs that are not true and based on an incorrect assumption about the world.

Occurs when a person struggles with alcohol or other drug use.

This means seeing, being aware of, and understanding the world around you.

having difficulty falling asleep or remaining asleep.

This drug separates the body from the mind,

Repetitive behaviors that a person feels driven to do.

Occurs when a person experiences delusions, hallucinations, or disorganized thinking.

This describes the way that people figure things out, solve problems, and do mental exercises such as planning.

unusually elevated mood or unusually irritable mood.

A drug that makes a person calmer, reduces anxiety and lowers stimulation from the senses.

when people talk but they don't make much sense and quickly jump from one topic to another.

Occurs when a person has serious problems related to mood.

A primary, progressive, chronic process with genetic psycho-social, and environmental factors influencing its development and outcome.

Excessively sleeping.

Drugs that reduce pain by slowing down the nerve messages going to the brain.

long lasting thoughts, impulses or images that are unwanted and cause distress.

Occurs when a person has periods of depression followed by periods of mania.

This results after prolonged exposure to a mood altering drug causes the cells in the body to become accustomed to the drug.

inability to remember previously learned information or loss of memory.

This important brain chemical regulates mood, emotion, learning, memory, sleep, and pain.