In the early stages of MS, people often experience:

* Muscle weakness

* Tingling or numbness

* Loss of balance

* Blurred or double vision

* And/or eye pain.

As the disease progresses, other symptoms may appear, such as:

* Muscle stiffness

* Heat sensitivity

* Fatigue

* Pain

* Difficulty thinking clearly

* And sexual problems.

The symptoms of multiple sclerosis generally appear between the ages of 20 and 40. It's important to know that MS can begin so mildly that a person doesn't even notice any symptoms until the disease has progressed. Also, the symptoms vary from person to person, and can change over time.