What is the most common early symptom of multiple sclerosis (MS)?

• A. Visual disturbances, such as blurred vision
• B. Motor weakness
• C. Loss of balance
• D. Speech difficulties

Answer: (A)

Visual disturbances, such as blurred vision, are indeed the most common early symptom of multiple sclerosis (MS). This occurs due to the demyelination of the optic nerve, leading to a condition known as optic neuritis, which is characterized by inflammation and swelling of the optic nerve. Patients may experience temporary vision loss or blurred vision, often in one eye. Visual symptoms such as these are often one of the first manifestations of MS and can present before other neurological symptoms arise.

While motor weakness, loss of balance, and speech difficulties can also be associated with MS, they tend to occur later in the disease progression or may not be as frequent in the early stages. Motor weakness can result from lesions affecting the pathways involved in muscle control, but visual symptoms are more prominent and indicative of early MS given the specific demyelination effects on the optic nerve.