"Stem from" is a commonly used phrase that refers to the source or origin of something. However, it's always good to have alternatives to diversify your writing. There are several synonyms for this phrase. Some good options include "arise from," "originate from," "emanate from," "derive from," "result from," and "spring from." Each of these phrases has a slightly different nuance or connotation, so it's essential to choose the one that best suits your context. By using these synonyms, you can add variety and depth to your writing and avoid repeating the same phrase over and over.