疑难杂症 difficult and complicated diseases
Explanation
指难以辨别或难以治愈的各种疾病，也比喻难以理解或解决的问题。
Refers to various diseases that are difficult to identify or cure, and is also used metaphorically for problems that are difficult to understand or solve.
Origin Story
老中医李时珍，一生悬壶济世，医术高明，远近闻名。一日，一位贵妇人带着她年迈的母亲前来求医。老母亲患病已久，身体虚弱，遍访名医，都束手无策。李时珍仔细为老母亲诊脉，又询问病情，反复斟酌，最终判断老母亲患的是一种极为罕见的疑难杂症。此病病理复杂，症状变化多端，就连李时珍也从未见过。为了治愈老母亲的疾病，李时珍翻阅了大量的医书古籍，夜以继日地查阅资料，潜心研究。他走遍了名山大川，采集各种珍奇药材，不断地改进治疗方案，一次又一次地进行尝试。经过无数次的失败，李时珍终于摸索出了一套行之有效的治疗方法。他用自己研制的特效药，配合针灸推拿等多种疗法，经过一段时间的治疗，老母亲的病情逐渐好转，最终痊愈。这个故事体现了医者仁心，以及面对疑难杂症的决心和毅力。
The old Chinese doctor Li Shizhen, devoted his life to medicine and had superb medical skills, was famous far and wide. One day, a wealthy woman brought her elderly mother to see him. The old mother had been ill for a long time, her body was weak, and many famous doctors had been unable to help her. Li Shizhen carefully examined the old mother’s pulse and inquired about her condition, repeatedly deliberating, and finally determined that the old mother suffered from a very rare and difficult disease. The pathogenesis of this disease was complex, and its symptoms changed dramatically, even Li Shizhen had never seen it before. In order to cure the old mother's illness, Li Shizhen consulted a large number of medical books and ancient texts, and he worked day and night to consult materials, and dedicated himself to research. He traveled all over the famous mountains and great rivers, collecting various rare and precious medicinal materials, constantly improving his treatment plan, and trying again and again. After countless failures, Li Shizhen finally found an effective treatment method. He used his own specially developed drugs, combined with acupuncture and massage and other therapies, and after a period of treatment, the old mother's condition gradually improved, and finally recovered. This story shows the doctor's compassion, as well as his determination and perseverance in the face of difficult diseases.
Usage
常用于形容医学上难以诊断或治疗的疾病，也比喻难以解决的难题。
Often used to describe diseases that are difficult to diagnose or treat in medicine, and also to describe difficult problems that are difficult to solve.
Examples
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医院里有很多疑难杂症的病人。
yi yuan li you hen duo yi nan za zheng de bing ren
There are many patients with difficult diseases in the hospital.
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这个问题就像个疑难杂症，一时半会儿解决不了。
zhe ge wen ti jiu xiang ge yi nan za zheng, yi shi ban hui er jie jue bu liao
This problem is like a difficult case that cannot be solved immediately..