Anxiety is a state of mind wherein you have distress over something. This is often seen as an emotion that overwhelms you psychologically, emotionally, and physically. Some people experience this occasionally but others experience this on a daily basis. When this happens, anxiety becomes an anxiety disorder. Anxiety then overpowers your daily life. This is caused by a malfunctioning amygdale (part of the brain that processes anxieties), low levels of neurotransmitter GABA, and stress.