1. Anxiety disorders involve excessive and persistent worries or fears that interfere with daily functioning, unlike ordinary worries or fears.
2. Common anxiety disorders include generalized anxiety disorder, panic disorder, phobias, obsessive-compulsive disorder, and post-traumatic stress disorder.
3. Proposed causes of anxiety disorders include biological factors like abnormal neurotransmitter levels or brain structures, as well as psychological factors like repressed urges, conditioning, or traumatic experiences.