Referring to the data you provided (large lump 3-4 inches, no pain, no nausea, the lump can be pushed), it is possible that you might be experiencing a type of abdominal hernia. What exact type of hernia it might be, cannot be determined for sure, because the exact location of the lump was not given.
A hernia is a sac filled with part of the intestines, lacking the normal muscle layer of the abdominal wall. Therefore the sac protrudes outwards presenting itself as a lump. This lump usually can be pushed back in the abdominal cavity, but it is only temporary, since only a slight increase in the abdominal pressure (coughing, defecation, sneezing) might cause repetitive protrusion of the intestines.
The definitive treatment includes surgery in which the abdominal muscles are connected together or the hole is shut with a kind of material.
You might want to visit an abdominal surgeon to check if the lump is really an abdominal hernia, and, if confirmed, whether it is big enough for surgery to be needed, or a kind of waist band might be enough to keep the hernia from additional complications.
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