No one I know likes to be criticized or judged, yet we do it to others all day long. This fear of criticism / judgement stops us in so many areas of our lives. This fear is simple to manage.
Being broke and having limited resources is a terrible feeling, and can really cloud your mind. People do crazy things for money out of the fear of poverty and desperation.
As humans, we want to be accepted and loved by others. The fear of being left out, ignored, or unappreciated is a very deep-seated fear, which is unsettling. Lost love is very painful. Personal Growth is dependent on others.
Being sick or weak is another terrible feeling. In former times, being sick or weak could lead to abandonment and death. That is the root of this fear. The power of positive thinking can heal your body.
The western world struggles with the notion of growing old for many reasons. When maturity or old age is viewed as useless, decrepit, and worn out, nobody would welcome this state of being. This fear is also easily overcome.
Like old age, death is part of the circle of life. When people focus solely on their physical, conventional , materialistic existence, of course there is fear of death. Focusing on the unknown can be a major distraction in life.