Health Advice



Cerebral venous sinus thrombosis: What to know about rare blood clot condition

Kristen Jordan Shamus, Detroit Free Press on

Published in Health & Fitness

Cerebral venous sinus thrombosis was reported in six American women after they were injected with the Johnson & Johnson COVID-19 vaccine, prompting federal officials to recommend a pause Tuesday in giving doses of the one-shot vaccine until an investigation can be completed.

But what is cerebral venous sinus thrombosis, and why are the U.S. Food & Drug Administration and the Centers for Disease Control and Prevention so concerned about it?

Dr. Geoffrey Barnes, a cardiologist and vascular medicine specialist at the Michigan Medicine Frankel Cardiovascular Center, told the Free Press Tuesday that the condition is an extremely rare form of stroke.

"This is a blood clot that forms in one of the veins that helps to drain blood from your head back down to your heart," Barnes said. "It's an uncommon place for blood clots to form, and when it forms up there, patients tend to have sort of a collection of symptoms."

Those symptoms, he said, can include:

Severe headache


Vision changes

Severe nausea


Rarely, some people will have seizures


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