Anxiety is an emotion characterised by an unpleasent state of inner turnmoil.

A phobia is a type of anxiety disorder defined by a persistent and excessive fear of an object or situation.

Addiction is a biopsychological disorder characterised by repeated use of drugs, or repetitive engagement.

Depression is a state of low mood and aversion to activity, it can affect a person's thoughts, behaviour, motivation, feelings, and sense of well-being