Dizziness in an occluded environment may be related to lack of oxygen in the brain, or it may be caused by migraine or heart disease. 1. Lack of oxygen in the brain: poor air circulation in an occluded environment, if you stay in such an environment for a long time, it is easy to cause a relative lack of oxygen in the body, resulting in a lack of oxygen in the brain tissue, which may cause dizziness. 2. Migraine: If there is a history of migraine, in the closed environment by the adverse environmental impact, is likely to trigger migraine attacks, may cause dizziness, may also be accompanied by headache, nausea and other symptoms. 3. Heart disease: commonly seen in arrhythmia, coronary heart disease and other diseases, these patients, if they stay in the occluded environment for a long time, it is likely to cause the above disease attacks, resulting in insufficient ejection of blood from the heart, which in turn causes a reduction in output, resulting in insufficient blood supply to the brain tissue, which may cause dizziness. Dizziness in an occluded environment may also be caused by other reasons, and should be removed from the environment in a timely manner. If the symptoms cannot be relieved, the patient should consult a doctor as soon as possible to clarify the causes and then give targeted treatment.