While "white tears" from a rat's eyes are not a definitive sign of pain, a significant amount of eye discharge, particularly if it's white or cloudy, can indicate a potential health issue and should be considered a cause for concern, potentially signifying discomfort or pain; it's best to consult a veterinarian to diagnose the exact cause."

"Key points about rat eye discharge:

Normal eye secretion:
Rats have a small amount of clear liquid around their eyes which is considered normal and helps lubricate them.

Stress or illness:
Increased tear production, including a white or cloudy discharge, can be a sign of stress, infection, or other health problems.

Possible causes:
Eye infections, respiratory issues, dental problems, allergies, or even tumors could lead to white eye discharge. "