Some people say clothes from SHEIN made them sick. One person got a cough, rashes, congestion, and felt really tired after wearing new stuff from the store. The clothes might have chemicals or dyes that are bad for your skin or that you breathe in.
The article also says fast fashion stores like SHEIN use stuff in their clothes that can be dangerous. Touching or breathing the chemicals can give you allergies, make your skin itchy, or make you feel sick. Cheaper clothes sometimes aren't tested well, so they can make people get sick more easily.