The model says the treatment is the reason behind her weight loss.
What is Gigi Hadid's thyroid disorder, Hashimoto's disease?
Gigi Hadid - Wikipedia
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What is Hashimoto's disease, what does it do to your body and what the symptoms of Gigi Hadid's condition?
Gigi Hadid reveals two-year struggle with thyroid disease
Gigi Hadid Says Her Body Has Changed Because of Hashimoto's Disease
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Gigi Hadid's Weight Loss Was Caused By This Medical Condition
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Gigi Hadid Reveals She's Been Suffering from a Thyroid Disease - Gigi Hadid's Thyroid Disease Behind Weight Loss