What is the most common symptom reported in multiple sclerosis?

• A. Paresthesias
• B. Fatigue
• C. Muscle weakness
• D. Color vision loss

Answer: (B)

Fatigue is the symptom MS patients report most often. It isn’t just simple tiredness from overexertion; it can be a primary consequence of CNS demyelination and also arises from secondary factors like sleep disturbance, depression, anemia, thyroid issues, or heat sensitivity (Uhthoff phenomenon). This combination makes fatigue a pervasive, persistent problem that patients frequently cite as their most limiting symptom, which is why it’s the best answer.

Paresthesias are common due to sensory pathway involvement, and muscle weakness occurs with motor pathway lesions, but neither is reported as frequently as fatigue across the MS population. Color vision loss happens with optic neuritis, but it’s less prevalent overall compared to the widespread fatigue many patients experience.