Lost around 6 pounds in 5 days from 183 to 177.5 ibs it natural to lose this much weight after being unable to eat after a wisdom tooth extraction?

Yes: Not being able to consume as much calories will produce significant weight loss depending on the level of your activity.

Possible: Calories are always burned and if not replaced by eating, will result in weight loss.

Rapid weight loss: Of course it is relatively normal becuase you were not eating any substantial calorie source of nourishment and drinking a lot of water, it is definitely easy to drop that amount or weight in that amount of time. I believe you will find once you get back into your normal routine you will likely put all of that weight back on, not to worry. As long as you generally feel good no cause for alarm at t.