Queensland boy not seen for three weeks

A 16-year-old southeast Queensland boy has been missing for three weeks.

The unnamed boy, who suffers a medical condition, was last seen on December 9 and was reported missing to police about a week ago.

It's believed he may be travelling between Toowoomba and Roma.

He is described as a Pacific Islander, about 170cm tall with a heavy build, dark brown hair and brown eyes.