There are many synonyms for the phrase "causing anxiety" that convey the same meaning with varying degrees of severity. Here are a few examples: unsettling, disturbing, worrisome, nerve-wracking, agonizing, stressful, hair-raising, harrowing, disconcerting, alarming, jolting, upsetting, frightening, intimidating, daunting, and terrifying. All of these words describe something that induces feelings of unease, fear, or discomfort, whether it's a situation, event, or person. It's important to identify and express these emotions in order to effectively deal with the source of anxiety and maintain a healthy mental state.