Who gets hurt the most by inflation?

Almost everyone. It would be easier to list those who would not be hurt. Certain investors and stocks/shares speculators would not be hurt as far as their investment goes but they would be adversely affected in other areas. Inflation (very simply put) means that the monetary value of something increases. If it is prices then people have to pay more. If it is wages then the employers have to charge more for their goods or services. In theory, if there were no inflation of any type, then the entire economy would remain stable. However this is not possible in a practical world. Because countries trade with each other, we all want to earn more etc then inflation will occur somewhere which in turn will affect (hurt) almost evryone to some extent.