Why do doctors say I am underweight, but BMI says I am a healty weight?

I am 5ft 4 and 96 pounds.
I don't think I am thin.

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BMI is only a rough guide. If I was at the lower end of weight according to my height in the BMI calculator, I'd look like a skeleton.

Manfredthemanic · 16-17, M

@Fluffybull Yes, Fluffy. But I don't think I look like a skeleton.

Fluffybull · F

@Manfredthemanic I'm not saying you look like a skeleton. But the range of weight it says is "healthy" is very wide. It can't identify different size of frame, muscular weight, etc. It can only be used as part of a guide to weight, not relied on totally.