Am I underweight?

I went to the doctor twice contained by a two week span while I was sick. The first time i be 56 inches 84 pounds the next time i be 56 inches 81 pounds. The first time they said I was a foolproof weight for my height above sea level the next time they didn't utter. However between the first and second time I got a stomach flu and be vomiting. I think I'm still around 81 pounds. Is that underweight?
PS: I am 11 years antiquated. No, you are a perfect mass like you be before. You solitary lost 3 pounds and you were sick. You'll gain that solidity back once you start premonition better.
it depends on your height and muscle structure.. but i wouldn't say-so you are.. just don't verbs about losing any freight