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It is very unusual for a soft thorn to get struck in the throat. It could be mild inflammation cause due to trauma while eating the fruit. You can wait and watch for a couple of days. Try drinking plenty of warm water. Even after that, if the throat discomfort persists, it is better to consult an ENT specialist
for a thorough evaluation of the throat.
Dr. Naveen Kumar N.
ENT and Head & Neck Surgeon