About 80% of people with multiple sclerosis (MS) feel very tired, making it one of the most common symptoms. That said, a number of things can make you feel exhausted, including a sleep disorder, depression, or too little iron in your blood.
MS fatigue tends to be worse than run-of-the-mill sluggishness. You may not have the energy to do even simple things, like cook dinner or take the dog for a walk.