Why does my head hurt when I squat down?

Headache upon squatting may result from neurogenic reflex regulation, increased intracranial pressure, cerebral embolism, or other factors. A detailed analysis follows:

1. Neurogenic Reflex Regulation

Headache upon squatting may be attributable to neurogenic reflex regulation. During squatting, venous return to the heart increases significantly, leading to a marked rise in blood pressure. Conversely, upon standing up, venous return suddenly decreases, causing a transient drop in blood pressure. This hemodynamic shift can induce dilation and stretching of cerebral blood vessels, thereby triggering headache symptoms—a normal physiological response.

2. Increased Intracranial Pressure

This symptom may also stem from elevated intracranial pressure, as seen in conditions such as intracranial infection or autoimmune encephalitis. Squatting can cause a sudden increase in intracranial pressure, resulting in a sensation of head fullness or throbbing pain; severe cases may be accompanied by nausea, vomiting, and other discomforts. Patients should seek prompt medical evaluation and treatment.

3. Cerebral Embolism

In patients with cerebral embolism—typically caused by cardiac emboli obstructing cerebral arteries—headache may occur alongside additional neurological deficits such as facial droop, aphasia, or loss of consciousness. With changes in posture during squatting, abnormal hemodynamic stress on cerebral vessels may exacerbate irritation at the site of pathology, precipitating these symptoms. Given the severity of this condition, surgical intervention may be required.

Additionally, cerebral infarction may also produce similar symptoms. It is strongly recommended that individuals experiencing such symptoms promptly consult a healthcare provider for accurate diagnosis and targeted treatment.