Simplify the following text for a Grade 8 native English-speaking person.
Original: Hodgkin 's lymphoma is characterized by the orderly spread of disease from one lymph node group to another and by the development of systemic symptoms with advanced disease .
Simplified: The symptoms of Hodgkin 's lymphoma change as the disease progresses . At the first stage of the disease , the person may feel a lump on the affected lymph node that does not hurt when touched .