brain fog
noun [ U ] uk/ˈbreɪn ˌfɒɡ/ us/ˈbreɪn ˌfɑːɡ/
脑雾，难以集中精神，无法清晰思考
a condition in which you cannot think clearly or pay attention to things in a satisfactory way
Side-effects of the treatment include tiredness and brain fog. 治疗的副作用包括出现疲劳和脑雾。