Hi,thank you for posting your query on health care magic.
The brown thick mucus coming from nose after
sinus surgery in mostly a mix of old blood(which might have occured during bleeding at the time of sinus surgery) with mucus secretions of nose.It is not suggestive of fresh bleeding.
Try using saline nasal drops and a
mucolytic like Ambroxol .It will help in liquifying and drainage of any old
blood clots with mucus secretions in the nose.Don't blow of cough forcefully as it may lead to fresh
nasal bleeding.Avoid removing any crusting in the nose as it may also lead to fresh bleeding.
If you suffer from fresh red coloured bleeding from nose,associated with weakness,
dizziness,any vision problem,etc,then it would be advisable to consult an Otolaryngologist doctor.
Hope this answers your question.Take care.