Anxiety is a feeling of unease. It can range from mild to severe and can include feelings of worry and fear. There are several conditions that can cause severe anxiety including phobias – an extreme or irrational fear of an object, place, situation, feeling or animal generalised anxiety disorder (GAD) – a long-term condition that causes excessive anxiety and worry relating to a variety of situations post-traumatic stress disorder – a condition with psychological and physical symptoms caused by distressing or frightening events