Post-COVID-19 condition is defined as the presence of symptoms that cannot be explained by other diagnoses, lasting for at least 2 months, occurring three months after a possible or confirmed SARS-CoV-2 infection. It is the result of a complex interplay of biological, psychological, and sociocultural factors, characterized by a high number of affected individuals, complex pathogenesis, diverse symptoms, and a significant need for long-term care. The diagnosis is considered exclusionary and can be classified into six subtypes, including non-severe COVID-19 multiorgan sequelae, pulmonary fibrosis sequelae, myalgic encephalomyelitis or chronic fatigue syndrome, postural orthostatic tachycardia syndrome, post-intensive care syndrome, and medical or clinical sequelae. Based on comprehensive evaluation, treatment and care can be provided through a multidisciplinary approach involving medication, diet, exercise, psychological interventions, patient education, and other methods.

新型冠状病毒感染后病症（PCC）定义为在有可能或确诊严重急性呼吸综合征冠状病毒2型（SARS-CoV-2）感染的3个月后，出现无法用其他诊断来解释的、至少持续2个月的症状。PCC是生物学因素、心理学因素及社会文化因素综合作用的结果，具有患病数较多、发病机制复杂、症状多样、长期照护需求大的特点。PCC的诊断被视为排除性诊断，可划分为"非重度COVID-19多器官后遗症""肺纤维化后遗症""肌痛性脑脊髓炎或慢性疲劳综合征""体位性直立性心动过速综合征""重症监护后综合征"和"医学或临床后遗症"6种亚型，在整体性评估的基础上，可在多学科协作的模式下，通过药物、膳食、运动、心理干预、患者教育等方法进行治疗和照护。