9. Anemia
Anemia is caused by the lack of red blood cells or the presence of dysfunctional red blood cells in the body, which creates a reduction in the flow of oxygen to the organs. It produces fatigue, weakness, paleness, shortness of breath, lightheadedness, dizziness, fast heartbeat, and, sometimes, headache. Occasionally, this symptom indicates bleeding in the stomach walls due to the deterioration caused by the ulcers. For that reason, it is advisable to treat them as soon as possible and with the appropriate measures. That way, future complications will be avoided, since, in the worst case, gastric ulcers can lead to stomach cancer.