经常感到紧张可以用英语表达为 "feel anxious/nervous frequently"。
"Anxious" 是形容词，意思是 "有焦虑的"，"nervous" 是形容词，意思是 "紧张的"。
例句：
She feels anxious before her exams. (她在考试前总是感到紧张)
He is nervous before giving a presentation. (他在做演讲之前总是感到紧张)
来源：Anxious 源于拉丁语 anxius，意思是"忧虑的"，Nervous 源于拉丁语 nervus，意思是 "神经的"。