Community AnswerAnswered by Dr. Emily Smith, MDAnswered: 1/16/2025Several factors can cause your A1C levels to be high, including: Poor Blood Sugar Management: Consistently high blood sugar levels over time will increase your A1C. Diabetes or Prediabetes: These conditions are directly linked to elevated A1C levels. Diet: A diet high in refined sugars and carbohydrates can lead to higher blood sugar levels. Lack of Physical Activity: Regular exercise helps regulate blood sugar levels. Medications: Certain medications, such as steroids, can increase blood sugar levels. Health Conditions: Conditions like kidney disease, liver disease, or anemia can affect A1C accuracy. Stress or Illness: These can temporarily raise blood sugar levels. If your A1C is high, consult your healthcare provider to identify the underlying cause and develop a management plan.