What will happen if my anemia is untreated?

Will get worse: If anemia is untreated it will get worse and will give you more symptoms. Symptoms will depend of the severity of the anemia and the cause of the anemia. Fatigue, lack of energy, dizziness, shortness of breath, chets discomfort on exertion, etc are the most common problems. Certain cause of anemia-like vit B12 deficiency can cause memory problem, lack of concentration, etc that can be irreversible.