Common Cat Health Issues Every Owner Should Know

Understanding Your Cat’s Health

Cats are experts at masking illness — an instinct inherited from their wild ancestors. By the time symptoms become obvious, a condition may already be advanced. That’s why knowing what to look for is so important.

This guide covers the most common health concerns cat owners face, from everyday digestive issues to subtle behavioral changes that could signal something more serious. It’s not meant to replace your vet — it’s meant to help you know when and why to call them.

Digestive Issues

Vomiting and diarrhea are among the most common reasons cat owners visit the vet. While occasional vomiting (especially hairballs) can be normal, frequent or severe episodes are not.

Common Digestive Triggers

• Eating too fast or too much at once

• Food allergies or sensitivities

• Hairballs (especially in long-haired breeds)

• Sudden dietary changes (always transition food gradually)

• Ingestion of foreign objects or toxic plants

• Intestinal parasites

When to worry: If vomiting or diarrhea lasts more than 24 hours, contains blood, or is accompanied by lethargy, see your vet immediately.

Signs Your Cat May Be in Pain

Cats rarely cry out in pain. Instead, they show it through subtle behavioral shifts:

• Decreased activity or reluctance to jump

• Hiding more than usual

• Reduced grooming or overgrooming a specific area

• Unusual aggression when touched (especially in one spot)

• Purring more than usual (cats sometimes purr to self-soothe when in pain)

• Changes in posture — hunching or guarding the abdomen

• Squinting or half-closed eyes

If you notice any of these, particularly in combination, schedule a vet visit. Pain that seems related to anxiety could also be worth exploring in our Cat Anxiety guide.

Appetite and Drinking Changes

A cat that suddenly stops eating or starts drinking significantly more water may be signaling a health issue.

Not Eating

Cats who stop eating for more than 24–48 hours risk developing hepatic lipidosis (fatty liver disease), a serious condition. Common causes include dental pain, nausea, stress, or illness.

Drinking More Than Usual

Increased thirst (polydipsia) can indicate kidney disease, diabetes, or hyperthyroidism — all common in middle-aged and older cats. Track water intake and report changes to your vet.

Respiratory Issues

Sneezing, nasal congestion, and watery eyes are common, especially in multi-cat households. Upper respiratory infections (URIs) are usually viral and resolve within 1–2 weeks.

Seek urgent care if: Your cat is breathing with their mouth open, panting at rest, or has blue-tinged gums. These are signs of respiratory distress and require immediate veterinary attention.

Skin and Coat Problems

A healthy cat has a smooth, shiny coat. Skin and coat issues can indicate allergies, parasites, nutritional deficiencies, or stress. Common problems include:

• Excessive shedding or dull coat

• Dandruff or flaky skin

• Bald patches (often linked to overgrooming from anxiety)

• Redness, bumps, or scabs

• Ear mites or parasites

Regular grooming helps you spot skin issues early.

Litter Box Warning Signs

The litter box is one of the best health indicators for cats. Pay attention to:

• Frequency: Urinating significantly more or less than usual

• Blood: Any blood in urine or stool warrants a vet visit

• Straining: Difficulty urinating can be a medical emergency, especially in male cats

• Consistency: Persistent diarrhea or constipation

• Avoidance: Suddenly refusing to use the litter box (could be medical or stress-related)

Monitoring Your Cat’s Health at Home

Regular observation is your best preventive tool. Consider tracking:

• Daily food and water intake

• Litter box habits (frequency, consistency)

• Energy levels and activity

• Weight (monthly weigh-ins are ideal)

• Grooming habits

• Any behavioral changes, however subtle

Keeping a simple log can help you spot patterns and give your vet valuable information during visits.

When to Call the Vet

Trust your instincts. If something feels off, it’s always better to call your vet and describe what you’re seeing. Seek urgent care for:

• Not eating for more than 24 hours

• Difficulty breathing or open-mouth breathing

• Straining to urinate (especially male cats)

• Blood in urine or stool

• Sudden collapse or inability to stand

• Seizures

• Suspected ingestion of toxins

• Severe or prolonged vomiting/diarrhea

For less urgent concerns, keeping notes and scheduling a routine visit is a great approach. Regular wellness check-ups (at least annually, or twice yearly for senior cats) are the best preventive measure.