What is the most severe type of phobia?
Each phobia can be severe. The real indicator of the worst phobia would be how adversely someone is affected by the phobia. For example, fear of heights can be easily avoided where as fear of spiders is not as easy. Probably the worst is agoraphobia which is the generalised fear of leaving your home or safe area. This is the only regularly treated phobia (not the only one but the most common). This is subjective and there may be other phobia’s that impair the quality of life.