Severe pain or agony — intense physical or mental suffering, torment or distress.
手術後の苦痛は数日続いた。
The pain after the surgery lasted for several days.
その出来事は彼に大きな苦痛を与えた。
That event caused him great suffering.
耐え難い苦痛に襲われた。
He was struck by unbearable pain.