There is a link between AstraZeneca's COVID-19 vaccine and very rare blood clots in the Lupus or Behcet’s syndrome– diseases that causes inflammation in the body. But other factors may play a role. Many cases have been linked to inherited and acquired thrombophilias, pregnancy, puerperium, infection, and malignancy. In rare cases, a severe blow to the head may cause cavernous sinus thrombosis. https://www.belmarrahealth.com/brain-stem-stroke-causes-symptoms-treatment Sometimes, clots can develop without infection. A handful of people who received the Johnson & Johnson vaccine developed complications from a clot originating in the veins near the brain, called cerebral venous sinus thrombosis, or CVST.This issue is seen in combination with low levels of blood platelets. Blood clot in brain will slowly inhibit brain function, including slowing down the time that the brain uses to process speech responses. Comprehensive Stroke Center Cerebral vein and cerebral venous sinus thrombosis - 5 - How is it diagnosed? https://www.buoyhealth.com/learn/whooshing-noises-inside-head Though extremely rare, VITT is much more severe than a typical blood clot because it can cause cerebral venous sinus thrombosis (CVST), where veins that drain blood from the brain … Sometimes the blood clot goes away before it causes permanent brain damage. However, sometimes the clot remains and causes a type of stroke called a venous infarct, or may cause bleeding into the brain (brain hemorrhage). A condition which is prone to blood clotting like diabetes, obesity or pregnancy. https://my.clevelandclinic.org/health/diseases/17675-blood-clots The cause of cavernous sinus thrombosis is usually an infection. There are two different types of blood clots. Clots that form in the eye may cause sudden blindness. Clots that block the flow of oxygen to the brain are the primary cause of strokes. Blood clots can occur in your arms and legs, abdomen (stomach), heart, lungs, brain, and kidneys. However, when a blood clot blocks blood flow to important areas of your body, it can be harmful, even deadly. Presence of an obstructing blood clot (thrombus) is referred to as thrombosis. Read more about the causes of cavernous sinus thrombosis. https://www.hopkinsmedicine.org/health/conditions-and-diseases/thrombosis https://en.m.wikipedia.org/wiki/Cerebral_venous_sinus_thrombosis A head injury. AstraZeneca can cause thrombosis in brain: Report. https://www.mayoclinic.org/symptoms/blood-clots/basics/causes/sym-200508… https://www.cedars-sinai.org/.../c/cerebral-venous-sinus-thrombosis-cvst.html https://www.verywellhealth.com/what-is-a-thrombotic-stroke-3146228 In some cases people developed a condition called CVST – cerebral venous sinus thrombosis – which causes clots near the brain and can trigger strokes if untreated. https://study.com/academy/lesson/causes-of-blood-clots-in-the-brain.html The blood carries oxygen and other important nutrients to the brain. 1 month ago Scientists in Germany have discovered that administration of the AstraZeneca vaccine could potentially produce antibodies that could accelerate the formation of blood clots in “unusual” cases as the WHO has not seen such a “causal” link. 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