<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 arachnophobia (fear of spiders), acrophobia (fear of heights), claustrophobia (fear of enclosed spaces), agoraphobia (fear of public places), zoophobia (fear of animals), and social phobia (fear of social situations). Symptoms of these phobias can vary greatly, but may include increased heart rate, sweating, trembling, shortness of breath, nausea, or dizziness.