Dementia is a known condition that involves the inability to reason, memorize, and think, that affects oneâ€™s activities of daily living. It is said that it is not a disease per se but a collection of symptoms brought about by underlying health conditions. Some form of dementia can be cured but others cannot. It is important for your doctor to understand the other diseases that you may have to see if it is treatable. Some causes of dementia are substance abuse, diseases of the blood vessels, diseases of the nerve cells, deficiencies, hydrocephalus, infections of the spinal cord and brain, head injuries, and other illnesses. Today, more and more people above 65 years of age suffer from dementia.