With sinusitis and gastric ulcer, the extent of the condition is different. Patients with sinusitis will have digestive symptoms such as abdominal pain, bloating, acid reflux, and heartburn. The abdominal pain of gastric ulcer will be more severe than that of sinusitis. The pain is rhythmic and usually appears or worsens after a full stomach, i.e. after a meal. The criterion to distinguish between the two is gastroscopy. During gastroscopy, in the case of sinusitis, mucosal congestion and erosion can be seen near the gastric sinus. In the case of gastric ulcer, the ulcerated lesion can be seen with yellowish white moss at the bottom and congestion and edema of the surrounding mucosa. Another way to distinguish between the two is pathology. In sinusitis, the mucosal rupture does not exceed the mucosal muscle layer; in gastric ulcer, the rupture or mucosal lesion will exceed the mucosal muscle layer.