A past negative event can induce unnecessary anxiety if over-generalization of the experience occurs in the brain
Taking a decision when there is a risk of pain or loss induces anxiety - science news in brief

A new study investigated how past negative or positive experiences influence decision making. We often generalize past experiences, as a mechanism for survival, however, sometimes over-generalization occurs. The study found that higher generalization occurred after a negative experience (pain or financial loss) compared to a positive one. Those people who generalized more from the negative events reported higher anxiety and intrusive thoughts. To understand better, imagine that you touch a flower and a bee that was there stings you. It is likely that in the future you will avoid touching any flowers, because of the generalization of fear. If this anxiety is not controlled, it may have negative consequences. The study also analyzed the brain regions involved in this process.

Read the full story: Eureka Alert
Scientific publication: eLife