Hi Doctor?i am 23 years old,and i need some answers from you concerning my healthy problem with my chest.so doctor, if i may ask,what could be the problem when i cough i see blood in my sputum?i had tuberculosis past twoyears now, and when i went for my sputum test, was negative. now i have pain in my chest when it s cold, and i cough some blood??help me doctor please