Discuss your needs with a medical professional before travel, carry any required medication, and prepare concise written explanations in Chinese for restaurants and hotels.
Keep the message specific
State the ingredient, the level of avoidance, and whether cross-contact matters. A long general explanation is harder to act on in a busy kitchen.
Choose support over risk
Ask accommodation staff for current local advice, favour places that can communicate clearly, and keep a simple backup meal available on travel days.