Tears are typically produced from glands in both eyes and should flow from both eyes when crying. If tears only come from one eye when you cry, it could be due to several potential causes:
Blocked tear duct: A blocked or partially blocked tear duct can prevent tears from flowing from one eye. This can sometimes be associated with additional symptoms such as persistent tearing, discharge, or infection.
Dry eye: Dry eye syndrome could potentially cause one eye to produce fewer tears than the other.
Facial nerve issues: If there's a problem with the facial nerve on one side of your face, it might affect tear production.
Allergies or eye irritations: These can sometimes affect one eye more than the other.
If you notice that you're consistently only crying from one eye, it's worth bringing up with a healthcare provider, as they could help identify any potential underlying conditions and suggest appropriate treatments. Please note that while this information is current medical understanding and best practices may have evolved. Always seek advice from a healthcare professional.