A phobia occurs when a negative emotion is attached to a triggering incident. Just one bad experience is enough to set off a lifetime of negative reactions to triggers including needles, enclosed spaces (claustrophobia), dental procedures etc. Hypnotherapy can explore the source of the precipitating event. Often the realisation alone is enough to dissolve the negative emotion. If not, further hypnotherapeutic techniques can replace the negatives with new perspectives and a positive outlook.