According to the National Institute of Neurological Disorders and Stroke , “multiple sclerosis (MS) is a chronic neurological disorder.” There are multiple types, and people can experience symptoms like cognitive changes, vision changes, and even paralysis. A study recently published in JAMA Network Open looked at the use of healthcare services in the 25 years before MS symptom onset. Compared to a matched cohort of participants without MS, participants with this condition used healthcare