开学，汉语解释有开设学校、启作学者、学期开始三个释义。但在日常生活中用的比较多的是学期开始。现代汉语中开学通常指学生们经过假期的休息之后，重新返回学校继续学习。根据国家与学制不同，每年的开学日会有2-4个，代表一个新学年开始的开学日一般会进行仪式。
The Chinese meaning of “start of school” is “opening a school”, “starting scholars”, and “start of the semester”. However, the term “start of the semester” is more commonly used in daily life. In modern Chinese, the start of school usually refers to students returning to school to continue their studies after a holiday break. Depending on the country and the school system, there are 2-4 start days each year, and a ceremony is usually held on the start day of a new school year.
【出处】：《东观汉记·张酺传》：“永平九年，诏为四姓小侯开学，置五经师。” 唐元稹《献荥阳公诗五十韵》：“ 郑驿骑翩翩， 丘门子弟贤。文翁开学日， 正礼骋途年。”
开学综合症
在假期结束之后开学之始，中小学生所表现出的一种明显的不适应新学期学习生活的非器质性的病态表现，心理学家们称之为“开学综合症”，又叫“开学恐惧症”。
“开学综合症”有多种表现形式，在生理上多表现为：失眠、嗜睡及一些查无原因的头晕、恶心、腹痛、大小便失禁、疲倦、食欲不振等；在心理上则多表现为：记忆力减退、理解力下降、厌学、焦虑、上课走神、情绪不稳定等。
心理医生认为这些表现都是人潜意识的心理防御机制，将一些不愿面对、不认同、被压抑、不愉快的负面情绪，转换成一些躯体症状而造成的，持续一段时间后症状有所好转。
[Source]: “Dongguan Hanji·Zhang Poetry”: “In the ninth year of Yongping, the emperor ordered the opening of schools for the four surnames and set up teachers of the Five Classics.” “Fifty Rhymes of Poems Presented to the Duke of Xingyang” by Yuan Zhen of the Tang Dynasty: “The Zheng post riders are graceful, and the children of Qiumen are virtuous. Wen Weng opened the school on the day of the ceremony and rode on the road.”
Start of school syndrome
At the beginning of the school after the holiday, primary and secondary school students show a non-organic pathological manifestation of not adapting to the study life of the new semester. Psychologists call it “start of school syndrome”, also known as “start of school phobia”.
There are many manifestations of “back-to-school syndrome”. Physiologically, it is mostly manifested as: insomnia, drowsiness, and some unexplained dizziness, nausea, abdominal pain, incontinence, fatigue, loss of appetite, etc.; psychologically, it is mostly manifested as: memory loss, decreased comprehension, aversion to learning, anxiety, distraction in class, emotional instability, etc.
Psychologists believe that these manifestations are all subconscious psychological defense mechanisms of people, which convert some negative emotions that are unwilling to face, disagree, suppressed, and unpleasant into some physical symptoms. After a period of time, the symptoms will improve.