Which of the following symptoms is NOT typically associated with riboflavin deficiency?

Severe fatigue is not typically associated with riboflavin deficiency. While riboflavin plays a significant role in energy metabolism and a deficiency can lead to some level of reduced energy production, severe fatigue is more commonly seen with deficiencies of other nutrients such as iron or vitamin B12, which have a more direct impact on red blood cell production and overall energy levels.

On the other hand, symptoms like cracking at the corners of the mouth, redness and swelling of the tongue, and increased sensitivity to light are classic signs of riboflavin deficiency. The cracking at the corners of the mouth (angular stomatitis) and the inflammation of the tongue (glossitis) are direct manifestations of inadequate riboflavin intake affecting mucous membranes. Increased sensitivity to light (photophobia) is also related to riboflavin deficiency due to its role in maintaining healthy eye function. This distinction helps clarify why severe fatigue stands out as not typically associated with riboflavin deficiency.