Cat Squinting and Losing Weight: Possible Causes & When to Act
Squinting in cats often indicates eye pain or irritation from infections, injuries, or corneal disease, and persistent squinting warrants veterinary evaluation.
Quick Answer
When a cat has squinting along with losing weight, the combination may indicate a more significant underlying condition. Weight loss alongside another symptom may indicate a chronic or systemic condition such as hyperthyroidism, kidney disease, inflammatory bowel disease, or cancer. These conditions are more common in older cats. A veterinarian can perform blood work and other diagnostics to identify the cause. Cat squinting, keeping one or both eyes partially closed, often indicates eye pain or irritation. Causes include eye infections, corneal ulcers, trauma, foreign bodies, glaucoma, or upper respiratory infections. Squinting that persists, is accompanied by discharge, redness, or pawing at the eye, should be evaluated by a veterinarian promptly. Contact a veterinarian if both signs are present, especially if either is severe or worsening.
SYMPTOM TRIAGE
Answer a few questions about your cat's signs and receive general guidance on how urgently to seek veterinary care.
This tool does not diagnose conditions or replace a veterinarian.
What Squinting Can Look Like
Squinting in cats is the partial or complete closure of one or both eyes. The cat may hold the eye shut, blink frequently, or paw at the affected eye. The eye may also show redness, discharge, cloudiness, or swelling. Squinting one eye is often more concerning than squinting both. When squinting occurs alongside losing weight, the combination provides important information about what may be happening. Weight loss alongside another symptom may indicate a chronic or systemic condition such as hyperthyroidism, kidney disease, inflammatory bowel disease, or cancer. These conditions are more common in older cats. A veterinarian can perform blood work and other diagnostics to identify the cause.
What May Be Associated with Squinting
Similar signs can have different causes, and the following are possible explanations a veterinarian may consider.
Corneal Ulcers
A scratch or ulcer on the cornea is a common cause of squinting in cats. Corneal ulcers are painful and require prompt veterinary treatment.
Eye Infections
Bacterial, viral (such as feline herpesvirus), or fungal infections can cause inflammation, discharge, and squinting.
Upper Respiratory Infections
Feline herpesvirus and calicivirus can cause eye inflammation and squinting along with sneezing and nasal discharge.
Foreign Bodies
A piece of debris or grass in the eye can cause squinting, tearing, and discomfort.
Glaucoma
Increased pressure within the eye causes pain and squinting. This is a serious condition requiring immediate attention.
The Combination of Squinting and Losing Weight
Weight loss alongside another symptom may indicate a chronic or systemic condition such as hyperthyroidism, kidney disease, inflammatory bowel disease, or cancer. These conditions are more common in older cats. A veterinarian can perform blood work and other diagnostics to identify the cause. The presence of both signs together may narrow the list of possible causes and help a veterinarian prioritize diagnostic steps.
What to Monitor
Tracking details helps a veterinarian assess the situation.
- Whether one or both eyes are affected
- Presence and type of discharge: Clear, cloudy, yellow, or green
- Eye appearance: Redness, swelling, cloudiness, or blood
- Whether the cat paws at or rubs the eye
- Light sensitivity
- Other signs: Sneezing, nasal discharge, lethargy, or reduced appetite
- When each sign started and whether they began at the same time
What You Can Safely Do Next
Do not attempt to remove foreign objects from the eye or apply human eye drops. Keep the cat in a clean, dimly lit environment. Prevent the cat from pawing at the eye. If squinting persists for more than a few hours, is accompanied by discharge or redness, or only one eye is affected, contact a veterinarian promptly. When squinting and losing weight occur together, do not delay in seeking veterinary guidance, as the combination may indicate a more significant issue.
When to Contact a Veterinarian
Some situations require immediate veterinary attention, while others may allow for monitoring. When in doubt, contacting a veterinarian is the safest approach.
Emergency Signs
Contact a veterinarian or emergency clinic immediately if you observe any of the following:
- Squinting with obvious eye trauma or a visible foreign object
- Squinting with severe discharge, swelling, or cloudiness
- Squinting with the eye appearing enlarged or very painful
- Squinting with lethargy or refusal to eat
- Any sudden change in the appearance of the eye
These signs may indicate a serious condition that requires prompt evaluation. In the US, the ASPCA Animal Poison Control Center can be reached at 888-426-4435 if toxin exposure is suspected. In the UK, contact your veterinarian or the Veterinary Poisons Information Service for guidance.
Non-Urgent Signs
The following may warrant a routine veterinary call rather than emergency care:
- Brief, mild squinting that resolves within minutes
When squinting occurs alongside another sign, veterinary evaluation is recommended sooner rather than later, as the combination may indicate a more significant condition.
Frequently Asked Questions
Why is my cat squinting one eye?
Squinting one eye may indicate a localized problem such as a corneal ulcer, foreign body, trauma, or infection. Because eye conditions can worsen quickly, a cat squinting one eye should be evaluated by a veterinarian promptly.
Can upper respiratory infections cause eye squinting in cats?
Yes, feline herpesvirus and calicivirus can cause eye inflammation, discharge, and squinting. Eye signs often accompany sneezing and nasal discharge.
What does it mean when my cat has squinting and losing weight?
The combination of squinting and losing weight may indicate a more significant issue than either sign alone. Weight loss alongside another symptom may indicate a chronic or systemic condition such as hyperthyroidism, kidney disease, inflammatory bowel disease, or cancer. These conditions are more common in older cats. A veterinarian can perform blood work and other diagnostics to identify the cause. A veterinarian can assess both signs together and recommend appropriate diagnostics and care.
SYMPTOM TRIAGE
If you are concerned about your cat's squinting and losing weight, use the symptom triage tool to get general guidance on how urgently you should seek veterinary care based on the signs you are observing.
This tool provides general information and does not replace a veterinarian's diagnosis.
Sources
- Cornell Feline Health Center. "Eye Disorders in Cats." Retrieved July 2026.
- Merck Veterinary Manual. "Eye Diseases in Cats." Retrieved July 2026.
- VCA Hospitals. "Conjunctivitis in Cats." Retrieved July 2026.
- American Veterinary Medical Association (AVMA). "Eye Health and Your Pet." Retrieved July 2026.
Disclaimer
This article and the PawAI Symptom Triage tool provide general information and do not replace examination, diagnosis, or treatment by a licensed veterinarian. If your cat shows emergency signs, contact a veterinarian or emergency clinic immediately.