Welcome to health care magic forum
As one bout of blood during cough is not so significant,as it can be due to so some trauma or infection ,but you must get it investigated Hb,TLC
, DLC ,ESR
,Mauntox test ,X-Rays Chest.,last but not the least sputum for AFB for three consecutive days. Smoking
should be avoided.If there is persistent of cough with sputum
or blood mixed sputum,loss of weight,or evening rise of temperature.you should give attention to problem.
Wish you good health