Home > Allergy > Hay fever Get the Flash Player to see this player. Rate: (Click the stars to rate) Published on Jun 22, 2008 by GScadding, Views: 6501 Hay fever is caused by mold, weeds, and pollen. It is very common. It causes symptoms in the spring and early summer consisting of runny nose, stuffy nose, cough, and watery eyes. Treatment of mild symptoms usually consists of an antihistamine.