Anemia dizziness and vomiting are due to lack of oxygen in the brain and digestive tract. Oxygen enters the blood after oxygenation through the lungs. Oxygen does not run into the blood on its own, it must combine with erythrocytes before it can enter the blood. Therefore, red blood cells play the function of carriers, moving rapidly in the body through the blood circulation to transport oxygen to various organs, including the activities of the hands, which also consume oxygen. If anemia occurs, the ability of red blood cells to carry oxygen decreases, and the main symptoms of oxygen deficiency are manifested when the ability to carry oxygen molecules decreases. The brain and heart, which have the highest oxygen requirements, are the main problems, and also the gastrointestinal tract, liver, and kidneys can be deprived of oxygen. Therefore, the dizziness you feel when you are anemic is mainly due to the lack of oxygen in the brain. In addition, the digestive tract is also a lack of oxygen when anemia is present. If a gastroscopy is performed, it will be found that the gastric mucosa is very pale, and the patient’s digestive ability will be reduced at this time. Therefore, the patient will experience loss of appetite, decreased digestive function, nausea, and even vomiting because the peristaltic ability and digestive capacity of the stomach will be decreased after anemia.