There is no official diagnosis as "chronic pharyngitis". In China, people with chronic sore throat or cough with chronic pharyngitis, but that is rather a symptom than a real diagnosis. Multiple causes can lead to chronic throat discomfort, and will be diagnosed differently. When you say blood steaks in sputum, how do you know it is from the pharynx?
It seems that your wife need a check up, starting at her primary care doctor , who will make the referral for specialist when needed.