People with panic disorders have an increased likelihood of having an aversion to bright light, according to a study presented at the European College of Neuropsychopharmacology conference in Berlin this week. Prior studies have found panic disorder has a strong seasonal component, but this is the first to study the role of light.

According to lead researcher, Dr Giulia Campinoti, “There have been several hints that photophobia is associated with panic disorder; for example in some people, fluorescent light can induce panic attacks. It had also been noted that people with panic disorder often protect themselves from light, for example by wearing sunglasses.

“We believe that photophobia is one of the elements which may increase the risk of people suffering from panic attacks, but this is a small study, so it needs to be confirmed by a longer-term follow-up trial. For example, we need to understand if the photosensitivity and panic attacks continue to be related over time.  If we can confirm this, then we may be able to take steps to avoid some of the triggers to panic attacks. It is important to note that our work shows an association, not necessarily a cause and effect. We don’t yet know exactly what the relationship might be, but there is probably some underlying biochemical basis.”

The study included 24 participants with panic disorder and 33 without. Those without panic disorder were actually attracted to bright light, while those with panic disorder showed moderate to strong levels of aversion to bright light.

Reference: European College of Neuropsychopharmacology (ECNP). "Panic attacks associated with fear of bright daylight." ENCP, Oct. 18, 2014.