Kidney or liver failure, which causes high levels of toxins to build up in the blood.Cardiac problems, such as heart failure, coronary artery disease, or irregular heartbeats (arrhythmias), that reduce blood flow.Asthma or COPD, which cause a decrease in the amount of oxygen or an increase in the amount of carbon dioxide in the blood.Infections, such as a urinary tract infection, respiratory infection, or sepsis. Health problems that can cause confusion or decreased alertness include: Depending upon the cause, amnesia may be either temporary or permanent.Ĭonfusion or decreased alertness may be the first symptom of a serious illness, particularly in older adults. Amnesia is memory loss that may be caused by a head injury, a stroke, substance use, or a severe emotional event, such as from combat or a car crash.Delirium can have many causes, such as withdrawal from alcohol or drugs or medicines, or the development or worsening of an infection or other health problem. Delirium can cause confusion, change the sleep-wake cycles, and cause unusual behaviour. Delirium is a sudden change in how well a person's brain is working (mental status).Alzheimer's disease is the most common cause of dementia in people older than age 65. Many health conditions can cause dementia or symptoms similar to dementia. Dementia is a slow decline in memory, problem-solving ability, learning ability, and judgment that may occur over several weeks to several months.Memory loss that begins suddenly or that significantly interferes with your ability to function in daily life may mean a more serious problem is present. This type of memory problem is more often annoying than serious. Not all older adults have memory changes, but they can be a normal part of aging. As you age, it may take you longer to remember things. It is not unusual to occasionally forget where you put your keys or glasses, where you parked your car, or the name of an acquaintance.
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