にちないへんどう
日内変動
Circadian variation, diurnal effects, diurnal rhythm
朝は調子が悪いが夜は気分が良くなるなど、1日のなかで症状の様子に変化がみられること。
The changes in a client's condition that can be observed throughout a day, such as feeling bad in the morning and feeling better by the evening.