| http://www.w3.org/ns/prov#value | - have not had these symptoms with a headache beforeThe headache starts very suddenlyThe headache occurs with repeated vomitingYou have a high feverAlso, call your doctor if:Your headache patterns or pain changeTreatments that once worked are no longer helpfulYou have side effects from medication, including irregular heartbeat, pale or blue skin, extreme sleepiness, persistent cough, depression, fat
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