2.5mm nodule grew to 8mm in upper right lung lobe in 3 years should i be worried?

See your physician.: A lung nodule that is increasing in size is always a cause of concern. Please see your physician to have this properly evaluated. It may require a biopsy to definitivly determine whether it is cancerous or benign. Best wishes.

Concern reasonable: It is important any lung nodule be thoroughly investigated and closely followed by a comprehensive thoracic team. As noted, a growing nodule is cause for concern. That said, the characteristics, location, and patient history impact decisions. Your concerns should be fully discussed with your physician.