Allergy Headaches Symptoms: Generalized headache; nasal congestion; watery eyes Precipitating Factors: Seasonal allergens, such as pollen, molds. Allergies to food are not usually a factor. Treatment: Antihistamine medication; topical, nasal cortisone related sprays; or desensitization injections Prevention: None Learn more about the relationship between allergies and headaches. Aneurysm Symptoms: May mimic frequent migraine...