Allergies Causing Depression

It is found that tree pollen can cause symptoms of depression. A psychologist at the Mood and Anxiety Program of the University of Maryland and School of Medicine analyzed surveys of 845 men and women and found that two thirds of the people surveyed reported mood difficulties during the spring season, which is when pollen levels are very high. It is believed that airborne allergens produce inflammation in the respiratory airways and the inflammation causes symptoms of depression in some people.

Another study was done on patients with mood disorders that found that increased allergy symptoms during times of high levels of pollen were connected with depression symptoms that were more severe. This study fits with earlier evidence that suicide rates increase during late spring and a family history of allergies affects depression in women.