Answers:
It could be a quantity of things.
If he drinks heavily, he could own ruptured varices contained by his esophagus and he requirements to see his doctor.
If he's just this minute have a nosebleed, it's residual blood and it's not a key concern unless it increases or continues to occur.
If he have a GI history and is susceptible to ulcer, he should step to the doctor as soon as an appointment can be made.
A honest impression is to build a doctor's appointment and enjoy a workup to be on the past the worst side.
Of course, if it persist or get worse, if the blood become bright red or the clots are full-size, step to the ER or send for an ambulance.
Clots freshly manner that the blood have sit within his digestive tract and/or stomach long adequate to start clotting up formerly it be expelled. If he is still doing this thieve him to the ER. If it be newly the one time own him see his doctor asap.
could own a bleeding carbuncle. stipulation to turn to er. My grandmother died of a bleeding carbuncle