医学上根据病因是否已知，将疾病的病因分为原发性和继发性两种。原发性是指病因未明的一类；而继发性病因明显。 例如：癫痫的病因尚未完全明了，历来的病因分类都将其分为原发性和继发性两种。前者是指病因未明的一类，又称原发性癫痫、特发性癫痫、遗传性癫痫、隐原性癫痫或真性癫痫等；而后者病因明显，又称继发性癫痫或症状性癫痫。
的临床综合症原发性和继发性原发性(primary, essential hypertension),占95% 高血压病,原因不明继发性(secondary hypertension),占5..
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继发性高血压 secondary hypertension
继发性青光眼 secondary glaucoma ; secondary ; secondry glucom
继发性主动转运 secondary active transport ; second active transport ; secondary transport
继发性红细胞增多症 secondary polycythemia ; secondary erythrocytosis
继发性肥胖 Secondary Obesity
继发性肝癌 secondary liver cancer ; secondary carcinoma of the liver ; Liver metastases ; secondary liver csomecer
继发性闭经 secondary amenorrhea
继发性妄想 secondary delusion
继发性感染原 [医] secondary invader
Secondary brain injury is a common cause of morbidity and mortality.
继发性脑损伤是颅脑损伤患者致死、致残的主要原因,但其发病机制尚未完全阐明。
参考来源 - 脑外伤后早期脑微血管内皮细胞的功能变化及其影响的实验研究·2,447,543篇论文数据，部分数据来源于NoteExpress
这些病人曾因原发性癌症做过手术，但是又有了继发性肿瘤迹象。
These patients had been operated on for the primary cancer but there was evidence of secondary tumours.
然而，可对继发性癫痫的已知病因采取预防性措施。
However, preventive measures can be applied to the known causes of secondary epilepsy.
头部外伤、中枢神经系统感染和肿瘤与继发性癫痫有关。
Head trauma, central nervous system infections and tumors are associated with secondary epilepsy.
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