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Reports said he had suffered severe headaches after the injuries caused an old neck injury to flare up.
BBC: Italian PM Silvio Berlusconi leaves hospital
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First time use of heroin can cause nausea, vomiting and severe headaches.
BBC: Factfile on drugs
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An estimated eight million people in the UK suffer from regular severe headaches - but most will not even trouble their doctor for help.
BBC: Family doctors get headache tips
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Signs of a stroke include dizziness, sudden weakness or numbness, loss of speech or trouble talking, severe headaches and a reduction or loss of vision.
CNN: Study: Low cholesterol is not enough to prevent stroke
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Temperature increases were found to increase the chances of people developing severe headaches, and low atmospheric pressure, which usually causes cloudy, stormy weather, can have a smaller effect.
CNN: Vital Signs health tips
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Severe headaches and blurred vision are also among symptoms.
WSJ: Problems in Pregnancy Signal Future Health Risks
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For some, a more realistic treatment goal may be simply less headaches and less severe pain if an episode does occur.
FORBES: What You Might Not Know About Treating Migraines
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The higher your intake of caffeine, the more likely you are to suffer from severe withdrawal symptoms, such as headaches, when denied the ingredient, according to experts.
CNN: Vital Signs health tips
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At first it seems like a case of severe flu, but then the fever rises, accompanied by headaches, excruciating joint pain, nausea and rashes.
ECONOMIST: Dengue fever
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Sex headaches associated with loss of consciousness, vomiting, stiff neck, other neurologic symptoms and severe pain lasting more than 24 hours are more likely to be due to an underlying cause.
CNN: Sex headaches