Fatigue, balance impairment, and fear of falling are common problems in individuals with Multiple Sclerosis (MS). Previous studies have shown significant associations among these variables; however, the mechanisms underlying the relationship between fatigue and fear of falling remain unclear. It is possible that fatigue increases fear of falling indirectly through its negative effects on balance performance.

Multiple sclerosis (MS) is a chronic demyelinating and neurodegenerative disease of the central nervous system that frequently leads to fatigue, balance impairment, and fear of falling. These symptoms negatively affect mobility, independence, participation in daily activities, and quality of life. Fatigue is one of the most common and disabling symptoms in individuals with MS and may contribute to impaired balance and an increased risk of falls.

Fear of falling is highly prevalent in people with MS and is associated with reduced physical activity, activity avoidance, and functional decline. Balance impairment is another common manifestation of MS and may represent an important mechanism linking fatigue to fear of falling. However, although fatigue, balance, and fear of falling have been investigated separately, the mediating role of balance in the relationship between fatigue and fear of falling has not been sufficiently explored.

The aim of this cross-sectional observational study is to investigate whether balance mediates the relationship between fatigue and fear of falling in individuals with multiple sclerosis. Fatigue will be assessed using the Fatigue Severity Scale (FSS), balance performance will be evaluated using the Mini-Balance Evaluation Systems Test (Mini-BESTest), and fear of falling will be measured using the Falls Efficacy Scale-International (FES-I).

The findings of this study are expected to improve the understanding of the mechanisms underlying fear of falling in individuals with MS and provide evidence to support the development of rehabilitation programs targeting balance to reduce fear of falling and improve functional outcomes.

Inclusion Criteria:

• Age 18-65 years
• Neurologist-confirmed MS diagnosis
• No relapse within the previous 30 days
• Ability to walk independently or with an assistive device
• Ability to understand instructions
• Voluntary participation

Exclusion Criteria:

• Recent MS relapse
• Severe vestibular disorder
• Other neurological diseases
• Severe orthopedic conditions affecting mobility
• Recent lower extremity surgery or trauma
• Cardiopulmonary conditions limiting assessment

The study population will consist of adults diagnosed with multiple sclerosis who are clinically stable and able to complete the study assessments. Eligible participants will be recruited from the outpatient neurology and physical medicine and rehabilitation clinics of Başkent University.