Scratchy sensation,lower left throat infrequent,comes & goes.began with flu (now gone).ent scope was clear,has improved but persists for 40 days, now

Irritability: If you had a severe viral sore throat and/or did a lot of coughing during your recent flu like infection, there may be some residual irritability in that portion of your throat causing the occasional scratchiness instead of a dry cough. Try lozenges or robitussin DM (guaifenesin and dextromethorphan) syrup as needed to sooth or heal this area of your throat.