比如，甲状腺功能衰减会影响新陈代谢，导致手脚冰凉；体内缺铁时，会影响血液携氧能力，导致手脚冰凉；压力过大时，体内激素和神经功能容易紊乱，导致手脚冰凉。

Guangdong has long been recognized as a key pillar of China’s economy, accounting for about one-tenth of the country's GDP.