Selma Blair opened up about her battle against Multiple Sclerosis (MS) in her documentary film Introducing Selma Blair, directed by Rachel Fleit. Selma was diagnosed with multiple sclerosis in 2018, but she had symptoms over a decade, leading her to believe she is suffering from the disease long ago. Multiple sclerosis is a lifelong condition that affects the brain and spinal cord and causes the immune system to attack one’s own healthy cells or the protective sheath (myelin) that covers nerve fibres, reports Mayo Clinic. MS can lead to problems with vision, sensation, arm or leg movement, or balance.