Allergies are caused by the body?s hypersensitivity to foreign substances such as pollen, animal dander, dust and food. Irritation of the mucous membranes along the upper respiratory system is common. Symptoms are sneezing, a runny nose, itchy eyes, irritation of the roof of the mouth, a stuffy nose, congested sinus areas and a headache. Allergies are not simple to treat; they generally represent a chronic problem that is genetic, although they may skip one, two or three generations. Homeopathic remedies can help in the acute stages of allergies to help relieve the symptoms, but usually a more constitutional approach to help the underlying condition is necessary for permanent help.