Why do 4-year-old children suddenly start biting things?

Patient's question:

Detailed medical condition and consultation purpose: Recently, the child suddenly started biting their hands, TV remote controls, and other objects, and likes to smear saliva randomly. What could be the reason for this? Is it possible they have roundworms in their stomach? The child loves sweet foods and snacks and has never taken any deworming medication. Thank you!

Doctor's answer:

Hello, this is to check for trace elements and see if there is a lack of zinc before treatment. Pay attention to choosing seafood and nuts as better options.

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