How do rebound headaches commonly occur?
This rebound syndrome is especially common if your medication has caffeine, which is often included in many pain relievers to speed up the action of the other ingredients. Though it can be helpful, caffeine in medications, along with the other sources you get (coffee, tea, soda, or chocolate), makes you more likely to have a rebound headache.
Overuse of pain relievers also can lead to addiction, more intense pain when the medication wears off, and other serious side effects.
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