Hello
I am Dr Ravinder sharma. On the basis of the information provided it appears blood in cough may be becasue of a disease of wind pipe or lungs.
Severe coughing can cause a tear in the mucosal lining on airway and may present as bllod in sputum. However you need a ENTconsultation to resolve the issue. If the examination and investigations suggests a disease it needs to be treated. \
I hope this answrs your concern. Feel free to contact me if you require more information about it
with regards
Ravindr Sharma