Vomiting/burping up FOAM soon after I eat -- normal? bad!?

I have found that, recently, after I eat I vomit white foam with some of the food. I didn't think I am having the "one bite too many" but it could obviously be a possibility because I can't avoid vomiting a little HOWEVER it always has A LOT of white foam with it. Has this happened to anyone? Do you know why?! Thank you!

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