The video shows Shelby inside the discount store with a caption that reads: "Me walking into a TJ Maxx." "As a TJ Maxx associate without the privilege of an associate bathroom, we are very well aware and you’re not alone." Why Does Shopping at TJ Maxx Make You Have To Poop? Credit: Jessica Williams TJ Maxx storeDr. Supriya Rao, an expert in internal medicine, gastroenterology, obesity medicine, and lifestyle medicine, offered a possible explanation to Buzzfeed. She also said the act of shopping - walking up and down aisles - helps to get things moving.