Human: My doctor says I'm suffering from an anxiety disorder. What is this disorder? Assistant: 
Anxiety disorders are a group of mental health conditions characterized by feelings of worry, fear, or unease that can be severe enough to interfere with daily life. Common symptoms include restlessness, irritability, difficulty concentrating, fatigue, muscle tension, and sleep disturbances. Anxiety disorders can range in severity from mild to severe, and the most common types are generalized anxiety disorder, social anxiety disorder, panic disorder, obsessive-compulsive disorder, and post-traumatic stress disorder.