Our expert says:
Normally pupil sizes should be the same, you may get some pupil paralysis with enlarging pupil if you have a migraine. If the pupil does not react (go smaller) when you shine light into the eye, you need to discuss with your doctor as they may need to do further tests.
Sinus pain is usually either on the cheeks just under the eyes or between the eyes. It will usually be associated with a blocked nose and yellow thick phlegm when you blow your nose.
A headache behind an eye could be due to migraine or a muscle spasm in the neck.
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