Low MCV (Mean Corpuscular Volume) indicates smaller than normal red blood cells. This can be caused by various factors, including iron deficiency, thalassemia, chronic diseases, or certain medications. The risks associated with low MCV depend on the underlying cause. Iron deficiency anemia, for example, can lead to fatigue, weakness, and impaired cognitive function. Thalassemia, a genetic blood disorder, can cause anemia, skeletal deformities, and organ damage. It's important to consult with a healthcare professional to determine the cause of low MCV and receive appropriate treatment to prevent or manage potential complications.