Symptoms of CIS are similar to those of an MS relapse. The main difference between the two conditions is patients with CIS experience only one episode, while MS patients experience multiple episodes.
Symptoms of CIS include:
- Numbness or tingling
- Vision problems, such as double vision
- Spasticity or stiffness of the muscles
- Difficulty controlling the bladder or bowels
- Difficulty with walking and coordination
- Muscle weakness
- Sexual dysfunction
Causes and Risk Factors
Patients with CIS tend to be diagnosed between the ages of 20 and 40, but the condition can occur at any age.
Since the risk of MS 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 the risk of CIS or MS.