World MS Day This is our favorite day on the calendar. It was set up to encourage everyone—patients and non-patients, individuals and organizations—to work together to raise awareness about MS and energize the global fight to find a cure. Other Terms Trigger Knowing what causes symptom flares can help keep them under control. Uhthoff’s Phenomenon The link between body temperature & MS symptoms. Vertigo Whether dizzy spells or the room spinning, vertigo can be linked to MS. White Matter A core part of the brain made up of axons. View more