Your question is asking how painful is the liposuction on the thighs compared with the abdomen during the procedure, not after. Physicians do peform liposuction differently with some patients being totally awake, maybe taking an oral anti-anxiety medication, and maybe some pain killer while the liposuction is done with tumescent local anesthesia. The upper abdomen can be tender if the lower rib area feels the motion of the cannula or the umbilicus can be tender if the anesthetic does not reach all the areas. This can happen if the doctor is reluctant to administer enough local anesthetic in this very sensitive area because it is hurting the patient too much so they hope the anesthetic diffuses to the area but then finds during the procedure it's not numb enough. That's why extra care is taken to slowly and comfortably administer the local anesthetic to these sensitive areas. If not enough time lapses in between the administration of the local anesthetic and the surgery or if there is scar tissue from prior surgeries, there may be a lack of anesthetic where needed and there can be more pain during the procedure. Other surgeons will have their patients sedated so that there is no pain during the procedure but the risks of the interaction of sedation and the large volume of tumescent anesthetic along with the daily medication that patients need to take for their other conditions, have to be considered. Usually the pain during the liposuction of the thighs and abdomen is very minimal if at all, during tumescent liposuction if the local anesthetic works well.