The most common silent reflux symptoms are hoarseness of voice, sinusitis, chronic cough, throat
-clearing, post-nasal drip, sore throat
, difficulty swallowing, shortness of breath etc. Other causes of blood in phlegm are bronchitis, throat infections, bronchiectasis etc.It is suggested to see an ENT specialist and get examined. You may need tests like complete blood counts, ESR,endoscopy and X-ray chest. Treatment will depend on the underlying cause. Keep me posted on how you are doing.