Symptoms may include: 1  Headache. 2  Dizziness. 3  Nausea. Shortness of breath. 4  Bruising. Lack of energy or tiring easily (fatigue)  Abnormal paleness or lack of color of the 1  skin. Blood in 2  stool. Nosebleeds. 3  Bleeding gums.  Fevers. Sinus 1  tenderness. Enlarged liver  or spleen.