<human>: What are some of the most common types of phobias and what are their symptoms?
<bot>: Some of the most common types of phobias include agoraphobia, claustrophobia, arachnophobia, acrophobia, zoophobia, social phobia, and fear of flying. Symptoms of these phobias may include feelings of panic or anxiety when confronted with a situation that triggers the phobia, avoidance of situations that cause distress, increased heart rate and breathing difficulties, sweating, trembling, nausea, and difficulty concentrating.