loss of blood (bleeding); the condition of losing blood due to injury or medical conditions, used in medical/emergency contexts.
事故で大量に失血し、すぐに輸血が必要だった。
He lost a lot of blood in the accident and needed an immediate transfusion.
小さな切り傷では失血に至ることは稀だ。
A small cut rarely leads to significant blood loss.
長時間の手術で患者が失血するリスクがある。
There is a risk of blood loss for the patient during a prolonged surgery.