The main reasons for dizziness and brain swelling are the following: 1. Excessive use of the brain, such as long hours of playing mahjong, games and work, are cases of excessive use of the brain. Because the oxygen consumption of the brain is the largest oxygen consumption of all organs in the body. Excessive use of the brain for a long time, will consume a lot of oxygen, resulting in the head ischemia, hypoxia. The lack of blood and oxygen in the head will cause cerebral vasodilation, and cerebral vasodilation will cause brain swelling. So you should pay attention to the combination of work and rest, do not use the brain for a long time; 2, neurasthenia, neurasthenia is a neurological disorder, neurological dysfunction, cerebral vasoconstriction will lead to dizziness, cerebral vasodilation will lead to brain distension. Therefore, patients with neurasthenia should see a doctor and take appropriate drugs; 3, hypertension, hypertension can cause cerebral vasodilatation and also arteriosclerosis. The dilation of cerebral blood vessels can lead to brain swelling and cause atherosclerosis, which leads to cerebral ischemia and causes dizziness. Therefore, people with hypertension should see a doctor in time to treat hypertension; 4, cerebral arteriosclerosis, older age or conditions that cause cerebral artery risk factors, such as hypertension, obesity, high blood lipids, diabetes, can lead to cerebral arteriosclerosis, cerebral arteriosclerosis makes cerebral blood vessels thicken and narrow, causing cerebral ischemia and hypoxia, and it leads to dizziness. In order to improve the ischemia and hypoxia, the cerebral blood vessels will dilate, which can lead to brain swelling. Therefore, if older patients have risk factors for cerebrovascular atherosclerosis, they should be treated promptly by taking drugs to unblock blood vessels and soften them.