 [ Symptoms ] i had rotatory cuff surgery and it locks up on me [ Disease ] 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