6Primary Progressive Multiple Sclerosis
Primary progressive multiple sclerosis affects about 15 percent of people with this condition. It is a more advanced stage in which the disability builds up over time. The biological mechanism is similar to that of secondary progressive multiple sclerosis. In addition, this type tends to occur at an older age, between mid and late 30s. The spinal cord tends to be more commonly affected, which leads to symptoms like tiredness, walking issues, leg stiffness, bowel and bladder issues, as well as sexual problems. In certain rare cases, primary progressive multiple sclerosis would cause damage to the cerebellum, a region in the brain. This would cause a loss of muscle coordination and tremor. [6]
