A phobia is excessive fear of one particular object or situation. For example an excessive fear of:
Animals or insects e.g., dogs, spiders
Natural environment e.g., storms, water
Specific situations e.g., tunnels, heights
Other types e.g., vomiting, clowns
People suffering with phobias will avoid the feared object/situation at any cost. Anxiety is triggered in the presence of feared stimuli or when anticipating the feared stimuli.