起身时“眼前发黑” 建议排查5种病

Group 1 - The phenomenon of "blackout" when standing up quickly is due to a temporary drop in blood pressure, known as "transient blackout" in medical terms [1] - This occurs because blood vessels in the legs are compressed during prolonged squatting, leading to reduced blood flow when standing up quickly [1] - The brain's signal to adjust blood flow and stabilize blood pressure is slower than the physical movement, resulting in insufficient blood supply to the brain and eyes [1] Group 2 - Some cases of "blackout" may indicate underlying health issues such as orthostatic hypotension, particularly in middle-aged and elderly individuals [2] - Diagnostic criteria for orthostatic hypotension include a drop in systolic blood pressure of more than 20 mmHg or diastolic blood pressure of more than 10 mmHg within three minutes of standing [3] - Other potential causes of dizziness and instability include low blood sugar, anemia, cervical spondylosis, brain diseases, and heart problems [4]