Why does a neurologist look at the tongue?

A neurologist examines the tongue to assess neurological function and identify potential signs of nerve damage or disease. The tongue's movement, strength, and appearance can provide insights into conditions like stroke, multiple sclerosis, or amyotrophic lateral sclerosis (ALS). Abnormalities such as atrophy, fasciculations, or asymmetry may indicate underlying neurological issues. Additionally, the tongue's appearance can reflect systemic health concerns that may also have neurological implications.