Biological factors play a major role in the development of mental illness. 生物因素在精神疾病的发展过程中起着很重要作用。
Sciatic pain is induced by mechanical or biological factors either by direct stimulation of axons or by neuroischemia. 机械因素或生物因素可诱发坐骨神经痛,既可以通过直接刺激神经轴突也可由于神经缺血所诱导。