The thymus of the patients who face leukemia goes bigger. It expands continuously. The greatest attack to this organ is a T-cell subtype. Thymus as a place is a bottom of the chest. The thymus is located just before the windpipe. A windpipe is known as a trachea. People who may suffer from this diagnosis complain of chronical coughing. It may be strong enough to prevent them from healthy sleep at night. Breathlessness is one more consequence. The body has a so-called SVC – superior vena cava. This is a primary vein. Its function is to deliver blood back to the heart. Expanded thymus creates the feeling of compression on the SVC; the blood returns in veins as a result.