Haws Syndrome In Cats: A Complete Guide

Cat Health & Wellness Amelia Tate March 11, 2025

When you notice your cat’s third eyelid showing, it could be a sign of Haw’s Syndrome.

This condition affects many cats, especially younger ones, and can be linked to various health issues.

If you spot the signs early, you can help your cat feel better and recover.

In this guide, we’ll explain what Haw’s Syndrome is, the common symptoms to watch for, what might cause it, and how to support your cat through recovery.

Understanding the condition will give you the knowledge to help your furry friend stay comfortable and get back to their usual self.

What is Haw’s Syndrome?

Haw’s Syndrome is a condition where a cat’s third eyelid (also called the nictitating membrane) becomes visible in both eyes at the same time.

The third eyelid is a thin membrane that usually stays hidden in the inner corner of a cat’s eye.

The condition gets its name from the “haw,” which is another term for this third eyelid.

While not dangerous by itself, Haw’s Syndrome often points to other health issues that need attention.

Most commonly seen in younger cats, this condition affects many cats each year, though exact statistics are limited.

Symptoms of Haw’s Syndrome in Cats

The main signs of Haw’s Syndrome include visible third eyelids in both eyes.

These eyelids might become more noticeable when your cat is awake instead of being tucked in the corners of their eyes.

In some cases, the third eyelids may protrude enough to cover part of the eye, but this is usually not harmful.

Diarrhea is also a common symptom and often appears alongside the third eyelid protrusion.

Some cats may experience a decrease in appetite, which could be related to the underlying health issue causing the condition.

Despite these changes, your cat’s eyes will still respond normally to light, and there won’t be any discharge or redness in the eyes.

Causes of Haw’s Syndrome in Cats

The most common causes of Haw’s Syndrome include digestive problems such as infections or inflammation.

These issues can trigger the syndrome by leading to symptoms like diarrhea.

Internal parasites, especially tapeworms, can affect your cat’s digestive health and contribute to the condition.

Poor nutrition is another factor, as cats not getting a balanced diet may experience health issues, including Haw’s Syndrome.

Stress can also affect your cat’s overall health, including the digestive system, which may worsen the condition.

Weight loss due to illness or dehydration can also contribute to Haw’s Syndrome.

Although the exact cause is unclear, many experts believe digestive health plays a significant role.

How is Haw’s Syndrome Diagnosed in Cats?

When you take your cat to the vet, they will likely perform a full physical exam.

They will check both eyes, focusing on the third eyelid to spot signs of the condition.

If necessary, your vet may use phenylephrine eye drops to confirm whether the third eyelid will retract, helping to rule out other potential causes, like Horner’s Syndrome.

The vet will also look for signs of digestive problems that could be related to diarrhea. Tests for parasites may be run if your vet suspects an underlying infection.

At home, you should monitor your cat’s litter box habits to watch for any signs of diarrhea.

Treatment and Management

In most cases, Haw’s Syndrome resolves on its own once the underlying health problem is addressed.

Treatment usually involves fixing any digestive issues your cat may have. If parasites are the cause, the vet will recommend deworming treatment.

Ensuring your cat stays hydrated is essential, especially if they have diarrhea.

In some cases, your vet might suggest using eye drops to temporarily reduce the visibility of the third eyelid.

Creating a calm, stress-free space for your cat will help them recover.You can provide fresh water, a bland diet like boiled chicken and rice, and quiet areas for your cat to rest.

Preventing Haw’s Syndrome in Cats

While you can’t always prevent Haw’s Syndrome, there are steps you can take to keep your cat healthy.

• Make sure your cat has access to fresh, clean water daily to avoid dehydration.
• Feed them high-quality food that’s appropriate for their age and health needs.
• Regular parasite prevention, as recommended by your vet, can also help reduce the risk of infection.
• Routine vet check-ups are important to catch any health problems early.
• Keeping your cat’s environment calm and consistent will also help prevent stress, which can affect their health.

Final Thoughts

Haw’s Syndrome in cats is usually mild and goes away once the underlying health problem is treated. With proper care, most cats recover within a few weeks.

It’s important to monitor your cat’s overall health, including their eating habits and litter box use.

If the third eyelid is visible, it can be concerning, but staying calm and following your vet’s advice will help your cat get back to normal.

Remember, Haw’s Syndrome is a sign that your cat’s health may need attention, so it’s a good time to check on their general well-being, not just their eyes.

Frequently Asked Questions

Can Worms Cause Haw’s Syndrome in Cats?

Yes, internal parasites like worms can trigger Haw’s Syndrome by causing digestive upset or weight loss.

Should I Take My Cat To The Vet for Haw’s Syndrome?

Yes, it’s best to have your vet check any eye changes. While often not serious, the condition may point to health issues that need treatment.

How Long Does Haw’s Syndrome Last in Cats?

Most cases clear up within 4-8 weeks with proper care and treatment of the underlying cause.

Is Haw’s Syndrome Painful In Cats?

No, the condition itself isn’t painful. However, the underlying causes might make your cat feel unwell.

Can Haw’s Syndrome Cause Vision Problems?

No, Haw’s Syndrome doesn’t affect vision. The third eyelid may block part of the eye but doesn’t damage the eye or impact sight long-term.