하지만, 대부분 일반적인 소화불량 증세와 비슷한데다 암이 꽤 진행될 때까지 두드러지게 나타나지 않아 자각하기 어렵다.
However, most of them are similar to common symptoms of indigestion and are hard to recognize because they do not stand out until the cancer is quite advanced.