Seven pound weight gain 3 weeks post-op Tummy Tuck with Lipo

This is due to healing, swelling, and ultimately water.  Humans are 60% water by weight.  Swelling after trauma or surgery will cause our body to store more water.  Additionally, expect this not to resolve until a period of 6-12 weeks.

Following plastic surgery and especially surgery around the soft tissues of the abdomen it is not uncommon for tissue to retain fluid. This may be even more likely following combined liposuction. Proper diet following surgery is important as well. Close follow up with you plastic surgeon at this time is a good idea.Post operative results continue to improve for months and are optimal at 3 to 6 months

Thanks for your question. This is more likely to be fluid, it is unusual to gain this amount of weight so quickly. An in-person examination can help clarify the problem.All the best,Dr. ResultsMiami, FL

Sounds like retention but ONLY in person examination plus labs can determine this. Please see your chosen surgeon Dr Broudo ASAP. 

This is most likely due to fluid from surgery and will take several more weeks for it to come off and you will see it on the scale.  I would not stress about your weight at this time and concentrate on getting well.  Continue to follow up with your PS.

Congratulations on having undergone the tummy tuck surgery. Yes, it is quite normal for patients to gain weight after surgical procedures. Patients tend to retain fluid; it may take several weeks for this fluid to “mobilize” and for patients to return to their preoperative weight. For more precise advice, continue to follow-up with your plastic surgeon.  Keep in mind, that it is also quite common for patients to go through significant emotional "ups and downs" during their postoperative course.Best wishes.