Some of the most common causes of headache and Migraines:

Food and Digestive Acids

Acidic Waste

Salicylates

Amines

Sinusitis Allergens

Fungus

Stimuli e.g. temperatures and temperature changes, barometric pressure

Chemicals e.g. Benzene, Aldehydes, Solvents

Perfumes e.g. deodorant, perfume, aftershave, pot pourri,

detergent perfume

Sulphur

Sulphites

Dairy

Caffeine, Coffee

Chocolate

Nightshades

Electrolytes

Additives, colorings, flavorings preservatives

Histamine (cluster headaches)

Diesel fumes, petrol fumes, petroleum

Pollution