An underlying medical condition (a preexisting illness) that can increase the risk of complications or severe disease.
新型ウイルスは基礎疾患のある人が重症化しやすいと報告された。
Reports indicated that people with underlying conditions are more likely to become seriously ill from the new virus.
基礎疾患には糖尿病や高血圧、心疾患などが含まれる。
Underlying conditions include diabetes, high blood pressure, and heart disease.
手術前には基礎疾患の有無を確認する必要がある。
It is necessary to check for any underlying conditions before surgery.