What causes headaches? how can they be prevented? does it indicate any vitamin deficiency?

see details: There are many causes of headache but none would be related to a vitamin deficiency in modern society.If headaches are severe and frequent, you need to see your family doctor or a neurologist.

Good questions!: Migraines have many causes; mostly they are inherited, but other factors (estrogen, stress, traumatic head injuries and others) can play roles, too. It may benefit you to identify what trigger your migraines; common triggers include more than 5 cups of coffee daily, chocolate, nitrates ; nitrites, sulfates ; sulfites, nuts, alcohol, msg, etc. See a neurologist to treat your migraines.

Hard to say but...: Treatment for headaches varies based on type of headache, location, duration, cause and age of the person. It varies from person to person even with exactly the same symptoms. Nutrition plays an important role in overall health. See a doctor for a thorough history and exam.