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Do you have any other symptoms in the left eye such as excessive watering from the eye or discharge?
The site of pain coincides with the area where the lacrimal sac is present. In case you have acute inflammation of the lacrimal sac ( acute dacryocysitis) it can cause pain at that site( between inner corner of the eye and the nose) along with redness and swelling in that region too.
If you do not have any of these signs or symptoms, then yes, it is likely that the pain is due to some kind of neuritis.
Though this is a very unusual site for neuritis to occur. If there is a known history of diabetes then the chances of nerve involvement is higher. Treatment is in the form of analgesics, high doses of vitamin B-complex or methylcobalamine and treatment of the underlying diabetes.
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