罹患

• Reading: りかん
• Romaji: rikan
• Kanji breakdown: 罹 (ri) — suffer from, be stricken by disease; 患 (kan) — affliction, illness
• Pronunciation: /ɾi.kaŋ/

Meaning

Contracting a disease; morbidity; being affected by illness. The act or state of being struck by a disease.

A formal medical noun and suru-verb (罹患する) used in epidemiology and clinical literature. 罹患率 (morbidity rate, attack rate) and 罹患者数 (number of cases) are standard epidemiological metrics. Considerably more formal than 病気にかかる (to catch a disease) and rarely used in casual speech. Found in academic papers, government health reports, and formal medical contexts.

Examples

1. 高齢者ほど重篤な疾患に罹患しやすいことが統計で示されている。 Statistics show that the elderly are more susceptible to contracting serious diseases.
2. 糖尿病に罹患している患者は、感染症への抵抗力が低下する傾向がある。 Patients with diabetes tend to have reduced resistance to infectious diseases.
3. この地域の肺がん罹患率は全国平均を大きく上回っている。 The lung cancer incidence rate in this region far exceeds the national average.

Usage Guide

Context: medicine, epidemiology, clinical research, public health, statistics

Tone: clinical, academic

Origin & History

Sino-Japanese compound: 罹 (ri) means to suffer from or be stricken by disease, a character used specifically in medical contexts. 患 (kan) means affliction, illness, or trouble. The compound has been used in Chinese classical medical texts and entered Japanese clinical vocabulary.

Cultural Context

Era: Modern

Generation: Adult

Social background: Professional/Academic