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Often, headaches are triggered by lifestyle or environmental factors such as stress, changes in weather, caffeine use, or lack of sleep. Overuse of pain medication can also cause a constant headache. ... You're at risk for these types of headache if you take OTC or prescription pain medication more than two days a week.

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lack of sleep, an incorrect eyeglass prescription, stress, loud noise exposure, or tight headwear can cause someone to have headaches.

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