久病成医 Long illness makes one a doctor
Explanation
指长期患病的人，对疾病的症状、治疗方法等有较深的了解，如同经验丰富的医生一样。也比喻人长期从事某方面工作，积累了丰富的经验，成为这方面的专家。
Refers to a person who has suffered from a long illness, and has a deep understanding of the symptoms and treatment methods of the disease, just like an experienced doctor. It also refers to a person who has been engaged in a certain type of work for a long time and has accumulated rich experience, becoming an expert in this field.
Origin Story
从前，有个村子里住着一位老中医，他医术高明，远近闻名。但这位老中医年轻时身体却很弱，经常生病。他从小就体弱多病，几乎没几天是健康的。因此，他比常人更能体会到病痛的折磨，也更了解各种疾病的症状和治疗方法。为了战胜病痛，他从小就研读医书，认真学习中医知识。久而久之，他不仅能辨认各种草药，还能根据病人的症状开出有效的处方。他常年与病魔作斗争，积累了丰富的临床经验。在一次次与病痛的搏斗中，他渐渐地对人体构造、疾病发生机制以及各种中药的药理作用有了更深入的了解。久而久之，他不仅医术精湛，还能根据病人的脉象、舌苔等细微之处判断病情的轻重缓急。他治好了无数人的病，成为远近闻名的神医。他那精湛的医术，不仅仅来自于书本上的知识，更来自于他多年的亲身经历和实践。他用自己的亲身经历，诠释了“久病成医”的真谛。
Once upon a time, there lived an old Chinese doctor in a village who was known for his superb medical skills. However, this old doctor was very weak when he was young and often fell ill. He was frail and sickly since childhood and hardly had any healthy days. Therefore, he could better understand the torment of illness and also better understood the various symptoms and treatment methods of various diseases. In order to overcome illness, he studied medical books and learned traditional Chinese medicine knowledge since childhood. Over time, he could not only identify various herbs but also prescribe effective prescriptions based on the patient's symptoms. He fought against diseases for many years and accumulated rich clinical experience. In the repeated battles with illness, he gradually gained a deeper understanding of the human body structure, the mechanism of disease occurrence, and the pharmacological effects of various Chinese medicines. Over time, he became not only a brilliant doctor but could also judge the severity of the disease based on the patient's pulse and tongue coating. He cured countless people's illnesses and became a famous miracle doctor. His superb medical skills did not only come from the knowledge in books but also from his many years of personal experience and practice. He used his personal experience to interpret the true meaning of "a long illness makes one a doctor."
Usage
形容一个人由于长期患病而对疾病的治疗方法有了深刻的了解，也比喻一个人长期从事某种职业而成为该领域的专家。
Describes a person who has developed a deep understanding of disease treatment due to long-term illness, and also refers to a person who has been engaged in a certain profession for a long time and has become an expert in that field.
Examples
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他久病成医，对中医药理颇有研究。
tā jiǔ bìng chéng yī, duì zhōngyī yàolǐ pō yǒu yánjiū.
He became a doctor through long illness, and he has a lot of research on traditional Chinese medicine.
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老张久病成医，自己就能判断病情了。
lǎo zhāng jiǔ bìng chéng yī, zìjǐ jiù néng pànduàn bìngqíng le。
Lao Zhang became a doctor through long illness and can judge his own condition.