Hi! Redness in the eyes can be due to allergy, dry eyes, a turned in eyelash, foreign body in the eye, corneal ulcer, conjunctivitis, cataract, glaucoma and in case of high blood pressure or coughing, it can be due to hemorrhage under the conjunctiva. It can also be a sign of stress, eye strain or poor eye sight. Please consult an eye specialist.
Hope this helps. Take care!
Pink eye?? This is just a hunch
Also, along with the advice weezer gave, please don't rub your eye and you always want to make sure your hands are clean before messing with your eye (trying to wash it out or just rub it).
If this gets worse or lasts more than 7 days, it's time to see the doctor.
There can be many causes for the redness and pain but since you state it is the inside corner, i immediately thought of a problem with the tear duct. vs pink eye. Google your symptoms but have it evauated if symptoms worsen or dont improve,