i’ve been coughing up blood today?
if the blood is first time to show in sputum. it would not be a reason to worry. the question is why did the blood came after brown sputum for a week? ! this is the cause of concern. so if you have been coughing much frequently recently and after a flu. then the brown could be due to infection of the lung which should not be neglected … a sputum culture is the first step. an xray of chest is next.