The causes of dizziness and brain swelling are mainly the following: 1. They may be caused by narrowing of the cerebral arteries and insufficient blood supply to the brain, which can be clarified by doing transcranial Doppler and cervical vascular ultrasound. 2. Many people experience dizziness and brain swelling when they have a cold, are overworked, or are sleep deprived. 3. The dizziness and brain swelling can also be caused by systemic diseases such as anemia, hypertension and heart disease.