A 41-year-old man with kidney stones developed a serious bloodstream infection caused by Candida glabrata, a type of yeast fungus that rarely infects healthy people. Although he initially received antibiotics, his condition worsened until doctors identified the fungal infection through blood tests. After placing a drainage tube in his kidney and treating him with an antifungal medication called micafungin, he recovered well. This case highlights the importance of considering fungal infections when standard antibiotics fail to treat kidney stone-related infections.