Hospital Anxiety and Depression Scale (HADS) was originally developed by Zigmond and Snaith (1983) and is commonly used to determine the levels of anxiety and depressiong.

The HADS is a fourteen item scale. Seven of the items relate to anxiety and seven relate to depression.

Each item on the questionnaire is scored from 0-3 and this means that a person can score between 0 and 21 for either anxiety or depression.