Multiple sclerosis (MS) is a chronic, progressive neurological disease that affects the central nervous system. The first signs of MS can vary greatly from person to person and can be difficult to recognize. Common early signs of MS include blurred vision, fatigue, and numbness or tingling in the limbs. Other symptoms may include cognitive changes, mood swings, dizziness, pain, and urinary problems. Diagnosis of MS is made through a combination of physical exams, medical history, imaging scans, and laboratory tests.