Hard lump ping pong size below my navel, doesnt move around,some discomfort/ pain sometimes.constipation, lost appetite. no fever.suggestions?

See doc: Best to see a doc and get a good physical exam and see if you need any imaging of your abdomen to evaluate this. It may be an umbilical hernia or lipoma or something else.

This mass can be: further characterized by a sonogram,A common cause of a mass in this location might be a hernia.Coughing or straining in the abdominal area would simultaneously make the mass slightly more prominent.You really need to have this examined and get the proper test ordered.