Toxic/Metabolic Headaches

There are several types of metabolic abnormalities that can result in headache. The two you might be most familiar with might be dehydration and hangover.

Exposure to toxic substances can also cause headaches. Examples of this would be exposure to chemical fumes or even household cleaning products. Another, however, would be drug-induced headaches. Common examples would be nitroglycerin and other nitrates taken for heart disease or medications like Viagra®, Cialis® or Levitra®. Be aware that many medications can cause headaches.