mental illnesses

1. an irrational fear of an object or event that poses little r no actual risk
5. mental illness in which a person loses touch with reality; often characterized by hallucinations, such as voices that other people cannot hear, and delusions
8. any chemical substance that changes a person's physical or psychological state
10. in obsessive-compulsive disorder, undesirable thoughts that occur constantl, causing anxiety
13. a health condition that changes a person's thoughts, emotions, and behavior and that affects the person's ability to undertake daily functions
14. a mental illness characterized by inattention, hyperactivity, and impulsivenesss; diagnosed most often in children
15. mental illness characterized by a combination of symptoms that include prolonged sadness and that interfere with a person's ability to undertake everyday activities

2. type of dementia that causes the death of brain cells and subsequent impairment of thinking and memory
3. the uncontrolled use of a drug
4. a mental illness that causes unusual shifts in a person's mood, energy, and ability to function; also known as manic depressive disorder
6. a mental illness in which a person feels too much anxiety, often in response to everyday situations
7. in obsessive-compulsive disorder, behaviors or rituals that develop in response to the anxiety caused by obsessive thoughts
9. a mental illness that develops after a terrifying incident that involved physical harm or the threat of harm
11. a feeling of worry and fear that causes physical symptoms, such as sweating and stress
12. unfounded or irrational distrust of other people