There are various synonyms for the phrase "are allergic to," which refers to a negative physical reaction experienced by someone who has been exposed to particular substances. Some alternative phrases could include; "have an allergy to," "suffer from an allergic reaction to," "intolerant of," "react negatively to," "develop symptoms when exposed to," and "sensitive to" among many others. Individuals might use these synonyms in place of "are allergic to" depending on the context, audience or personal preference. Allergies can be severe, and it is essential to understand the meaning and use of synonyms in communication for everyone's safety.