Progressive relapsing multiple sclerosis (MS) is a rare form of MS that causes steady damage to nerves when symptoms first appear and continues to cause damage to the central nervous system even when there are no symptoms. Relapses (disease flare-ups) occur, followed by full or partial recovery, but nerve damage continues and symptoms become increasingly disabling.

Symptoms of MS include:

• Weakness, leg dragging, and stiffness.
• Blurred, foggy, or hazy vision.
• Tingling, a pins-and-needles sensation, and numbness.

While there is no cure for MS, medications can reduce the number, frequency, and severity of relapses and may slow the progression of the disease.