"Be stricken by" is a phrase that is commonly used to describe a sudden illness or misfortune that has affected someone. There are several synonyms that can be used in place of this phrase to create a more varied vocabulary. Some possible alternatives include "be afflicted with," "be hit by," "fall ill with," "be overcome by," "be inflicted with," "be struck with," and "be besieged by." These phrases can help add depth and nuance to your writing, while still conveying the same basic meaning as "be stricken by." By expanding your vocabulary and exploring different ways of expressing ideas, you can improve your writing skills and create more engaging content.