Trypophobia, also known as intensive phobia, intensive object phobia, and intensive (type) syndrome, is one of the common phobias, and its main symptom is that it is sensitive to relatively small things arranged densely. Patients generally have had unpleasant experiences with dense objects before, which leads to subjective over-sensitivity to this stimulus. People with intensive phobia will have symptoms such as migraine, panic, sweating and rapid heartbeat when they see soap bubbles, aerated chocolate or other objects with holes. September 20 13, the latest research shows that the rejection of group caves by patients with intensive phobia is to avoid the evolutionary adaptive side effects of toxic animals.

Dense phobia is the most common phobia, which is caused by patients' subjective over-sensitivity to this stimulus because they have had unpleasant experiences with dense objects before. People with intensive phobia will have symptoms such as migraine, panic, sweating and rapid heartbeat when they see soap bubbles, aerated chocolate or other objects with holes. According to a new study, this fear may stem from human vigilance against poisonous animals, because there is visual similarity between them.