Spring brings grass and tree pollens, while fall brings weed pollens. Many people suffer from hay fever symptoms all year long. These symptoms include runny nose, watery eyes, sneezing, sore throat, coughing, headaches, and ear buzzing. Until recently, scientists were looking for one specific cause of allergies. They are now finding that allergic reactions have many causes.
Heredity plays a major role in allergies.
A person may inherit a predisposition to an allergy. It is, however, the tendency to become allergic to foreign substances rather than a specific allergy that is inherited. A person's biochemical individuality can be another cause of allergies. Their genetic requirement of nutrients may be much higher than normal for the prevention of disease. The metabolic pattern of other people may cause them to react very differently to similar substances.