A specific phobia has the earliest average age of onset of all anxiety disorders. Specific phobias involve a very strong anxiety response to a particular cue, which is excessive to the danger involved. Common examples include fear of spiders or cockroaches, paruresis (anxiety-related difficulty with urination), fear of driving, emetophobia (fear of vomit), or fear of blood or needles. Most people seeking treatment have had these fears for many years, often since early childhood, and only seek treatment when it starts to get in the way of their lives. Common precipitants of treatment are living environments with feared objects like roaches, or the necessity of medical or dental work for physical health. Luckily for those with a specific phobia, treatment for this has some of the highest efficacy in all of clinical psychology.