A hard lump in the stomach may not necessarily be stomach cancer. For example, gastric polyps and benign tumors in the stomach can also manifest as hard lumps in the stomach and need to be diagnosed through gastroscopy. Erosive gastritis, peptic ulcer, duodenal ulcer, etc. can cause the weakening of gastrointestinal peristalsis, resulting in the formation of local hard lumps, which usually do not cause obvious pressure pain and can disappear on their own. For poorly mobile and fixed hard masses, it may suggest tumor. In contrast, stomach tumors are divided into benign tumors and malignant tumors. Benign tumors are mostly found in gastric smooth muscle tumors and gastric mesenchymal tumors, and gastroscopy can reveal hard masses with clear borders and smooth surfaces, which can be removed by surgery. If the hard lump in the stomach persists or increases in size and is irregular to the touch, it may be considered a malignant tumor in the stomach and can be biopsied under gastroscopy to confirm the diagnosis by pathological examination and then take targeted treatment. Regardless of whether the stomach lump is benign or malignant, patients need to undergo systemic evaluation for early detection and early treatment.