The malady itself, one from which she had often suffered, a bilious fever—its cause therefore constitutional.
疾病本身，一种她经常遭受的疾病，一种胆汁热——因此它的原因是体质的。
英语百科
Bilious fever
Bilious fever was a medical diagnosis often used for any fever that exhibited the symptom of nausea or vomiting in addition to an increase in internal body temperature and strong diarrhea. "Bilious" means the condition was thought to arise from disorders of bile, the two types of which were two of the Four Humours of traditional Galenic medicine in 200 A.D.