Several things: High blood pressure and trauma are among the more common causes of a burst blood vessel in the eye. This can be brought on by something as benign as a sneeze or a cough although heavy lifting and vomiting can also play a role. Chronic high blood pressure can predispose you to this as can blood-thinning medications such as Aspirin and Coumadin (warfarin) and certain herbal supplements such as ginkgo.
Answered 3/29/2021
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Strain or cough: But often will occur for no known reason. Also sometimes caused by blood thinners.
Answered 5/9/2017
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