患
huàn · HSK 7
contract (an illness)
🤒 患 = 串 (skewer) over 心 (heart): troubles run through the heart, so you fall ill
The top 串 is a skewer threading objects in a row; stacked on 心 (heart) it reads as worry piercing straight through you. That sense of being run through by trouble extends to contracting an illness: huàn.
患 — 串 chuàn (phonetic) + 心 heart
A semantic-phonetic compound: 心 'heart/mind' gives the meaning of inner worry, while 串 'string/skewer' suggests the sound. The original sense was anxiety or troubles weighing on the mind, which later extended to 'suffer from' an illness or calamity.