A lasting adverse condition or symptom that remains after an illness or injury (a sequela).
彼は事故の後、後遺症で手にしびれが残った。
After the accident he was left with numbness in his hand as an after-effect.
ワクチンの副反応はあるが、重い後遺症は稀だ。
Vaccines can have side effects, but serious long-term after-effects are rare.
脳の損傷は記憶障害などの後遺症を引き起こすことがある。
Brain damage can cause after-effects such as memory impairment.