The stem cells are formed by the leukemia cells in the bone marrow.These cells have uncontrolled growth and lead to decrease production of normal blood cells.From this point of view the symptoms are:anemia, increased risk of bleeding which include bleeding gums, nosebleeds, bruising, increased risk of infection, slow healing.

The common symptoms of leukemia are:fatigue, lack of appetite, weight loss, fever,sweating.When leukemia arrives to the thymus gland the possible symptoms are:coughing or shortness of breath when the trachea is pressed by the enlarged thymus and swelling of the head and arms (SVC syndrome) when the superior vena cava is pressed by the enlarged thymus.

In the case when the leukemia spreads to the central nervous system there are other possible symptoms like: headaches, poor school performance, weakness, seizures, vomiting, poor balance, blurred vision.Other potential symptoms are: enlargement of the liver and spleen, enlargement of the lymph nodes,enlargement of the testicles and bone or joint pain.