Upper-left sickness radical - a person lying on a bed tipped sideways. It indexes 痉 in the medical-symptom family alongside 病 illness, 疼 ache, 疫 epidemic, 疯 mad. Marks the whole character as a bodily malady.
Inside is a 5-stroke contracted form of 巠 - the standalone glyph has 7 strokes, here squeezed into a tighter shape. Supplies the sound jīng then jìng with tone shift only. Same phonetic family: 经 to pass through, 颈 neck, 径 path, 茎 stem.
