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An attack of sore throat
can cause dryness of the throat, with congestion of the posterior pharyngeal wall. Whenever there is severe dryness of the throat due to friction of the tissues inside the throat there can be sub mucosal bleeding, any how malignancy cannot be ruled out. I would advice you to drink plenty of warm water to keep your throat moist, avoid any oily/spicy/very hot/chilled items. Also try using povidone iodine
throat gargles, it can give you good relief. Any more doubts you are welcome.
Dr. Naveen Kumar