患者,男,42岁,码头搬运工,腰部疼痛2 年,常于冬、春季加重,休息及服吲哚美辛后缓解,最近腰痛加剧,不能弯腰,体查脊柱无畸形,无压痛,弯腰45°时左下肢感牵扯痛,腰椎照片椎体正常。该患者腰痛原因可能为
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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