Deep breathing dizziness is caused by the decrease of carbon dioxide in the blood, resulting in respiratory alkalosis. After deep breathing, the body’s carbon dioxide excretion increases and oxygen inhalation increases, resulting in hyperoxemia or hypoxemia, causing respiratory alkalosis and symptoms of dizziness, panic, sweating, and even shock. In addition, deep breathing dizziness should also be considered as cerebrovascular lesions. Some patients suffer from cerebrovascular stenosis, especially childhood smog, which is characterized by cerebrovascular spasms during deep breathing, such as crying, eating hot food, blowing balloons, etc., causing insufficient blood supply to the brain, resulting in symptoms of dizziness when breathing deeply, accompanied by symptoms of cerebral ischemia such as transient aphasia, light paralysis, and limb numbness. If you are in a plateau area, due to the lack of oxygen, when you take a deep breath, you cannot inhale enough oxygen, which will lead to lack of oxygen to the brain and cause dizziness.