Why not head fan to blow?

Answer:

The blower is suitable for choosing the head. If the fan blows directly to the head and neck, the scalp temperature drops, the reflex causes the contraction of the cerebral blood vessels, and the brain blood flow also decreases. For the elderly with cardiovascular and cerebrovascular diseases, severe stroke can be induced

The electric fan blowing directly to local head, by cooling the blood flow slowed down, while the other half blood flow in normal operation, the head of poor blood flow, causing brain nerve oppression, brain rich and complex, directly transmitted to the pain receptors, so it is easier to feel a headache.

If the fan against unilateral facial blowing, and the danger caused by facial paralysis, facial paralysis, although the cause is unknown, but is currently recognized as one of the triggers local cold. Because the cold, nutrition nerve vascular spasm contraction, cause nerve ischemia, edema, swelling compression and degeneration.

Blow to the head when the heart and brain stroke