Corrosive injury to the esophagus and stomach occurs when a person ingests acidic or alkaline substances, often accidentally or in self-harm attempts. These substances can cause severe burns, leading to inflammation, ulceration, and scarring of the gastrointestinal tract. Symptoms may include intense pain, vomiting, and difficulty swallowing. Long-term complications can involve strictures or even an increased risk of cancer. Immediate medical attention and evaluation are critical.