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AstraZeneca vaccine headache: What causes Covid vaccine headache?

Boris Johnson reveals he will receive AstraZeneca vaccine

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AstraZeneca jab fears have led health officials to issue a warning to the general public. They have identified a symptom – headaches – which could signal a more severe underlying disorder. People who experience a four-day-long headache must report the issue to their health provider.

What causes Covid vaccine headaches?

Headaches which last for four days have emerged as a concerning sign for Covid vaccine recipients.

The announcement to report such symptoms follows fears the AstraZeneca jab could cause blood clotting.

These headaches are a hallmark sign of Cerebral Venous Sinus Thrombosis (CVST), a clotting disorder.

CVST causes a range of symptoms, which include:


Abnormal vision

One-sided weakness of the face and limbs


A coma

Five men aged between 19 and 59 suffered from the disorder, which can prove deadly.

But CVST is “extremely rare” according to Dr June Raine, chief executive of the Medicines and Healthcare products Regulatory Agency (MHRA).

The link to the Covid vaccine remains unproven as well.

The UK cases are similar to dozens of clotting disorder cases found across Europe.

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Some of these have resulted in deaths, but health agencies have concluded the Covid vaccine remains safe after investigation.

MHRA vaccines lead Dr Phil Bryan told journalists yesterday there is “no proven causal association”.

He said: “We have had five reports of a unique form of blood clot, Cerebral Venous Sinus Thrombosis concurrent with low blood platelets.

“This is similar to some of the cases reported through Europe.”

“What we don’t know is whether these have been caused by the vaccines.

“We are working closely to determine this because these illnesses do very rarely happen naturally.

“We do know that after more than five million jabs this is extremely rare – less than one in a million cases of this even after vaccination.

“There is no proven causal association with what is still an extremely rare medical event.”

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