"It is estimated that between 45% and 65% of all people with MS experience problems with memory, attention, word-finding, problem-solving, or other cognitive functions as a symptom of the disease. These cognitive changes can vary considerably from one person to another, both in type and severity. There is very little relationship between the severity of physical symptoms and the severity of cognitive problems. One person may have severe physical symptoms but no problems with cognition. Another person may be very physically fit but have severe problems with thinking and remembering."MORE....UCSF Multiple Sclerosis Center