Social inhibition is what keeps humans from becoming involved in potentially objectionable actions and/or expressions in a social setting. The significance of this inhibiting behaviour varies greatly from person to person, and may be closely linked to a person's confidence.
- Many recreational substances can significantly lower a person's inhibitions, notably alcohol. Alternatively, some substances may actually strengthen these inhibitions. As an example, abuse of stimulants may lead to anxiety and heighten inhibition. This is more common in drugs with dysphoric effects.