Military physicians speculated that its prevalence among Swiss mercenaries abroad was due to earlier damage to the soldiers 'ear drums and brain cells by the unremitting clanging of cowbells in the Alps. 军队医生们猜测,派驻外国的瑞士雇佣兵中无比流行的怀旧病,是因为他们的耳膜与脑细胞有过早期损伤。受伤的来源则是阿尔卑斯山上永不停息的声声牛铃叮当。