High anxiety is a term used to describe a state of intense fear, worry, and unease. It can manifest in physical symptoms such as increased heart rate, sweating, and trembling. STRESS, HYSTERIA, AGITA, ACROPHOBIA, PANIC, PHOBIA, and ANGST are all terms related to high anxiety. STRESS is a feeling of strain or pressure caused by a situation or event. HYSTERIA is an uncontrollable outburst of emotion or fear. AGITA is a feeling of unease or distress. ACROPHOBIA is an extreme fear of heights. PANIC is a sudden feeling of fear or anxiety. PHOBIA is an irrational fear of something. ANGST is a feeling of deep anxiety or dread.