What effect can being underweight have on you?

Question

I am under weight, but not because I want to be, I just am.

What effect can being underweight have on me, especially as a woman?

My BMI is 16.0 where normal BMI should be 18.5

Should I see a doctor?

Answer 1

No, 16 isn't all that low.

Really underweight girls--like anorexics--can lose their periods and even experience things like heart trouble. But you are nowhere near that skinny.