A mental condition
Different people suffer to different degrees. For some people with arachnophobia it is just a mild condition. Other will yell and scream if they see a spider or spider web. They might become very anxious or start sweating. Their heart might start to speed up or they might have troble breathing. A person who suffers from arachnophobia might avoid going near dark corner. They might even avoid reaching underneath their kitchen sink to grab a bottle of detergent. They do this because they fear that a spider is living there and will attack them. People who suffer badly from arachnophobia cannot enter a room unless someone else checks it out for spider first. One women called miss muffet was so afraid of spider that she washed her car twice a day. She even used a burning cigarette to scare off the spider