Niuniu, from east China's Jiangsu Province, had been eating her own hair since she was three. She had eaten so much that it knotted itself into a massive hair ball as hard as a stone in her tummy.
Niuniu's parents were aware she was pulling her hair out, but didn't realise she had been eating it.
Doctors say the hair ball, which was yellow, was around four to five cms in diameter.
She is expected to make a full recovery.
More on Parentdish: Hair ball weighing four pounds removed from girl's stomach