Stomach tumors—whether benign or malignant—usually start quietly. Early signs feel like everyday indigestion, so many people ignore them until the mass is large or bleeding.

Stomach pain is the first hint. It feels like a dull, persistent ache or burn just above the belly button and doesn’t go away with antacids.

Fullness shows up early. You feel stuffed after only a few bites, or the stomach feels heavy even when you haven’t eaten.

Weight loss is common. Clothes feel looser, yet you haven’t changed your diet.

Nausea or vomiting may occur. Food comes back up, sometimes with blood that looks like coffee grounds.

Black, tarry stools appear when the tumor bleeds. The stool smells foul and sticks to the toilet bowl.

Late signs include vomiting blood, yellow skin (jaundice), or a hard lump you can feel—an alarm that the tumor has spread.