separation anxiety disorder; SAD
Psychiatric term for excessive anxiety concerning separation from home or attachment figures. Used in clinical contexts.
Separation anxiety disorder can be seen not only in children but also in adults.
分離不安 (separation anxiety) is the broader feeling or symptom, while 分離不安症 specifically refers to the clinical disorder.
Compound of 分離 (separation), 不安 (anxiety), and 症 (disorder/syndrome). A modern clinical term likely calqued from English 'separation anxiety disorder'.