It is difficult to understand why arachnophobia, a fear of spiders, is so common in the human race but it is most certainly in the top 10 phobias. The reality is that only a tiny number of spiders are poisonous and let's face it humans are absolutely enormous if you are a spider! We would be interested to hear from arachnophobia sufferers and how they see this particular condition. What brought it on? Why is it so common?