Allergy Headache 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 Aneurysm/Subarachnoid Hemorrhage Symptoms: … Continue reading The Complete Headache Chart