The common reasons for patients to feel light and fluffy are as follows: 1, insufficient cerebral blood supply: patients with cerebral hypoxia, ischemia, which can produce light dizziness, head swelling; 2, hypoglycemia: it can also cause fatigue, making people feel light and fluffy; 3, anemia; 4, endocrine diseases: such as hypothyroidism. The causes of this symptom are many, if it is a transient symptom, it can be temporarily observed; if this symptom occurs frequently, it is necessary to accurately diagnose the cause of the disease, and carry out symptomatic treatment in a timely manner.