In extremely rare cases, constant headaches are a symptom of a serious disease, such as a brain tumor. If you experience chronic headaches, along with nausea, vomiting, or weakness in your arms or legs, visit a doctor to investigate the cause.
Brain tumors can also cause seizures. If other symptoms accompany your persistent headaches, it is best to seek medical advice to rule out any sinister cause. Keep in mind, however, that brain tumors are rare and not a common cause of headaches.

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