Dear Dr
My son is 21 years old in very good heath and he noticed a lump in the centre of his chest. When I touch it, it felt very hard like it is apart of his rib cage. It only hurts him when I sweeze it. He will be going to his GP tomorrow but. he is also worried because he recently started a new job and if it means he will have to take time off to go to the hospital this may cause problems. do you know what this might be?