Hiya I am 30years old. Ongoing issues passed three months with doctors saying it's gastritis. Waiting an endoscopy. I noticed after I opened my bowels lump was just belowy tail end of sternum and when I felt it, it disappeared. Opened bowels again and no lump. Does it sound like a hernia to you? Can't notice any lump now but if it was stomach cancer would I be able to feel a lump in my tummy?

hope someone can help