The affect multiple sclerosis has on the body is sometimes hard to detect. Dr. Kathleen Hawker, UT Southwestern Medical Center at Dallas assistant professor of neurology, said changes like blurred vision, numbness or weakness can occur over hours, days or even weeks. “Symptoms can also get better over days or weeks and can recur,” Hawker said. MS is the most common disabling neurological disorder of young people and affects about 500,000 Americans, most between the ages of 20 and 40. People with MS can experience double vision, bladder changes and balance problems. If you are experiencing unexplained fatigue associated with symptoms like Hawker described, she recommended seeing your doctor. “There are effective treatments available to reduce MS attacks or slow progression of the disease,” Hawker said.