LYCOS RETRIEVER 
Headaches: Occurs
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Headaches in the setting of hemodialysis for kidney failure can occur from too little sodium concentration in the dialysis fluid (Ref.4, p. 1511). Another mechanism of developing a headache in association with hemodialysis is when the blood pressure has significantly dropped about 4 hours after the start of hemodialysis (Ref.4, p. 1512).
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Experiencing headaches during pregnancy is one of the most common discomforts and complaints. Headaches may occur at any time during your pregnancy, but they tend to be most common during the first and third trimesters.
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It is the most common form of headache and accounts for 70 per cent of headaches. It can occur in people of either sex and at any age but it is most common in adults and adolescents.
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Severe high blood pressure that has been present a long time can cause headaches. The pain is throbbing, occurs in spasms, and is felt at the back or top of the head.
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Blood pressure headaches occur when the blood pressure goes highly above what is the accepted norm for blood pressure. Other times blood pressure headaches may develop because there is a sudden and sharp increase in the blood pressure level.
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