Doctor Warns of Red Flag Cancer Symptom During Dinner – Difficulty swallowing food or drink could indicate oesophageal cancer, warns expert Dr. Joseph Salhab. This symptom can lead to coughing, choking, and regurgitation and should not be ignored. Other potential signs of the disease include unintentional weight loss, chest pains while eating, and uncontrolled vomiting. If experiencing any of these symptoms, seek medical advice promptly to rule out serious conditions.