My son hit a table a bit rough with the lower abdomen. his 4 now when he pee almost nothing come out but looks like the bladder is full. is there something we can do to help him at home and avoid the hospital?

See pediatrician: I recommend taking him to a pediatrician based on the history of trauma. If there is any injury to the bladder or pelvis there are NO home remedies to correct this. The first rule of thumb is "Do no harm", and if we try a home remedy it could make the situation mucch worse. The swelling could be something else, but without a physical exam it is impossible to say.