Hi, I am 25 years old and unmarried girl. Normally I am prone to cough and cold as asthma is our ancestral disease. From few days back I am having ribs and back pain and sometimes blood appear in the phlegm. This happened few months ago too. I consulted a doctor and had x rays and blood test but everything was normal. Except the haemoglobin and vitamin d was very low. The back pain comes and go. Mi am a teacher and have to stand all day. Is the back n rib pain normal or it is a sign of something very dangerous. I am very stressed. Please suggest me.