I called it "fructose intolerance" only because it's easier to equate it to lactose intolerance, but the proper name is "fructose malabsorption."
It's when the cells in the intestines are not able to digest or absorb fructose properly, and causes much the same symptoms as lactose intolerance.
"Fructose intolerance," on the other hand, is a rare genetic condition where the body lacks the enzyme aldolase B, which is needed to break down fructose in some crucial metabolic pathways.
It is much more serious and can lead to liver failure or death.