**1. Introduction**

Corrosive ingestion is a medical emergency that is especially prevalent in developing countries such as Thailand [1–9]. Since 2020, the COVID-19 has had an enormous impact on many sectors worldwide, and it had affected the trend of rising incidence and severity of diseases [10]. However, the actual incidence should not be precise as the tip of the iceberg phenomenon is probably under-report [4, 8]. Currently, various studies on this topic are still being developed for medical knowledge to the achievement goal of the best practice. Perforation and stricture are complications of corrosive ingestion which are currently being researched and which are discussed in this chapter.
