患者 (huàn zhě) literally means 'one who suffers' — 患 (huàn) means 'to suffer from (an illness)' or 'to be afflicted', and 者 (zhě) is a classical suffix meaning 'person' or 'one who...'. Together, they form a formal, neutral term for 'patient' — the person receiving medical care. It is widely used in hospitals, clinics, medical records, news reports, and official health communications.

Unlike more colloquial terms like 病人 (bìng rén), 患者 carries a slightly more professional, respectful, and objective tone — it emphasizes the clinical relationship rather than personal identity or emotional state. It’s commonly found in compound terms such as 住院患者 (zhù yuàn huàn zhě, 'inpatient'), 门诊患者 (mén zhěn huàn zhě, 'outpatient'), and 患者隐私 (huàn zhě yǐn sī, 'patient privacy'). While it can refer to people with physical or mental conditions, it is rarely used for animals — that context belongs to veterinary terms like 病畜 (bìng chù).