Fear of crowds is called enochlophobia. It is the fear of getting stuck, lost, or harmed in a crowd. It's also called demophobia. It’s closely related to agoraphobia (a fear of open spaces or public places, especially where crowds gather) and ochlophobia (a fear of mob-like crowds). The United States' National Institute of Mental Health estimates that about 12.5% of the population experience this phobia at some point during their lifetime. (A fear becomes a phobia when it’s excessive, irrational, or impacts a person's day-to-day life)