Symptoms of primary-relapsing multiple sclerosis are similar to those of the primary-progressive variant of the disease. The main symptom of both forms of the condition is a gradual worsening of disability.
This may be experienced through increased:
- Numbness or tingling
- Vision problems, such as double vision
- Spasticity or stiffness of the muscles
- Difficulty controlling the bladder or bowels
- Problems with cognition, such as learning and memory or information processing
- Difficulty with walking and coordination
- Muscle weakness
- Mood changes
- Sexual dysfunction
Causes and Risk Factors
Only 5 percent of all multiple sclerosis patients are diagnosed with PRMS, and its cause is unknown.
Since the risk of multiple sclerosis is significantly higher when a parent has been diagnosed with the disease, genetic factors may play a role. The unusual relationship between a person's geographic location during childhood and the risk of MS later in life suggests there may be environmental factors at work in the disease.
Patients with PRMS tend to be diagnosed in their mid-to-late 30s, and the condition affects men and women equally.