If a person gets up dizzy and black-eyed after squatting: 1. The most common factor is upright hypotension, also known as postural hypotension, which is a manifestation of abnormal blood pressure regulation. It is especially common in the elderly population, and when you stand up quickly, you will have dizziness, black eyes, fainting and other symptoms; 2, for when the blood volume is insufficient, for example, when high fever causes patients to become dehydrated or acute gastroenteritis and other factors that lead to significant dehydration; 3, adverse drug reactions, if the patient has taken a large number of vasodilators, diuretics, antihypertensive drugs and antidepressants, there will also If the patient has long term cardiac insufficiency or is bedridden for a long time or has fever, dizziness and black eyes will also occur in these cases due to diminished regulatory function.