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Squatting for a long time and standing up black in front of your eyes is a problem with the heart?

After squatting for a long time, I stood up and felt that my eyes were black, what was going on? In fact, squatting for a long time to stand up and blackening in front of the eyes is a manifestation of cerebral ischemia, which is likely to be due to orthostatic hypotension caused by brain ischemia symptoms.

Squatting for a long time and standing up black in front of your eyes is a problem with the heart?

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