Is this normal?

My weight keeps fluctuating. It’s never by a lot, but I can see my collarbone and cheekbones getting more pronounced, my hip bones stick out more, and then a month or so later it goes back. I’m overweight, 14, 5’5” and 150 lbs, but I’m generally fairly skinny still. I don’t know if losing weight like that is normal or...? I’ve already been tested for thyroid complications.

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