Low oxygen levels in the brain can affect concentration ability by causing difficulty in paying attention and by causing temporary memory loss. Additionally, low oxygen levels can cause a reduced ability to exercise good judgment, make sound decisions and perform body movements, according to Healthline.
Mild symptoms of oxygen deprivation to the brain such as inattentiveness may progress to more serious symptoms such as seizure and coma if oxygen levels remain low. It eventually progresses to brain death even though cardiovascular function may still be preserved, according to the National Institute of Neurological Disorders and Stroke.
Low oxygen levels in the brain can be serious and potentially life-threatening since the brain is not able to function properly without a constant supply of oxygen, as MedlinePlus indicates. The risk of sustaining severe brain damage due to low oxygen levels in the brain depends on how quickly oxygen supply is restored to the brain.
Low oxygen levels may be present in a person who is choking, suffocating, in cardiac arrest or drowning, states Healthline. Other causes of low oxygen levels in the brain include medical conditions that stop or interrupt the brain's oxygen supply such as a stroke, head trauma, brain injury or carbon monoxide poisoning.