Hairballs in Cats: Why They Form and How to Reduce Them
Cats spend a large share of their waking hours grooming. The backward-facing barbs on the tongue work like a comb and collect dead hair, which the cat swallows. Most of it passes through the digestive tract and leaves in the faeces. Some remains in the stomach, accumulates and is eventually brought back up. That is a hairball.
Why do hairballs form in cats?
Because hair cannot be digested. When the amount swallowed exceeds what the digestive tract can carry, it accumulates in the stomach. That amount is higher in long-haired cats, during seasonal moulting and in cats that over-groom, which is why hairballs are more frequent in these groups.
What frequency is considered normal?
| Frequency | Assessment |
|---|---|
| Once a month or less | Commonly considered normal |
| Once a week | Worth monitoring |
| More than once a week | Needs assessment — consult a vet |
| Retching with nothing produced | Urgent — may indicate obstruction |
The accompanying findings matter as much as the frequency. A cat that brings up hair and then behaves normally with a good appetite is not in the same situation as one retching without producing anything.
How do you tell hairball vomiting from other vomiting?
Bringing up a hairball resembles retching more than vomiting: the cat extends its neck, produces a cylindrical hair-containing mass with rhythmic contractions, and returns to normal immediately after. In digestive vomiting the content is liquid or food, it repeats, and it is usually accompanied by loss of appetite or lethargy. This distinction cannot be settled at home; repeated vomiting requires an examination in any case.
See a veterinarian without delay:
- Retching with nothing produced, repeated failed attempts
- Vomiting with loss of appetite, lethargy or constipation
- Defecation stopping
- A tense abdomen or reaction to touch
- Hairballs recurring more than once a week
If any of these are present, this calls for an examination, not nutritional support.
How can hairballs be reduced?
- Regular brushing. The most effective method; you remove the hair before the cat swallows it. Two to three times a week for short hair, daily for long hair.
- Increase water intake. Adequate fluid is needed for the tract to move its contents.
- Look into the cause of over-grooming. Stress or itchy skin increases grooming; in that case the hairball is not the real subject.
- Complete the diet. Healthy coat structure is directly related to the amount of hair shed.
Coat Shine Oil contains salmon oil as an Omega-3 source, flaxseed oil as an Omega-6 source, vitamin E, biotin and zinc, and contributes to maintaining a healthy coat structure. One 5 ml measure daily, mixed into food. We cover shedding in our guide to hair loss in cats and the digestive side in our digestive problems in cats article.
Frequently asked questions
Are hairballs dangerous?
Usually the cat brings the mass up itself and the episode closes without incident. But if the accumulation cannot move through the digestive tract it can cause an obstruction, which is an emergency.
Do short-haired cats get them too?
Yes. Coat length affects the amount but is not the only factor. A short-haired cat that over-grooms may have hairballs more often than a long-haired cat that grooms little.
Does brushing really make a difference?
Yes, and it is the cheapest method. Every tuft left in the brush is hair the cat did not swallow. Grooming also gives you a regular chance to check the skin and coat.
Basis: Hairball formation and frequency assessment follow general veterinary references. The product statement is based solely on the Coat Shine Oil formulation (salmon oil, flaxseed oil, vitamin E, biotin, zinc).
This content is for information only and does not replace a veterinary examination. Nutrasion products are complementary feeds; they are not medicines and make no claim to prevent or treat disease. Consult your veterinarian for every decision specific to your animal.
About the author
Metehan Çalıkuşu, DVM
Metehan Çalıkuşu, DVM is the founder and lead veterinarian of Yenitepe Veterinary Clinic. Their clinical practice covers small animal internal medicine and nutrition.
Frequently Asked Questions
Why do cats get hairballs?+
Because hair cannot be digested. The backward-facing barbs on a cat's tongue collect dead hair during grooming and the cat swallows it. Most of it passes through the digestive tract and leaves with the stool; when the amount exceeds what the tract can carry, part of it accumulates in the stomach and is brought up over time. The amount is higher in long-haired cats, during seasonal coat change, and in cats that over-groom.
How often is a hairball considered normal?+
Once a month or less often is widely considered normal. Once a week is a frequency to monitor; more than once a week calls for assessment and a veterinary consultation. Retching without bringing anything up is an emergency and may indicate an obstruction. Accompanying signs matter as much as frequency: if loss of appetite, lethargy or constipation is present, the picture is different.
How do I tell a hairball from other vomiting?+
Bringing up a hairball resembles retching more than vomiting: the cat extends its neck, expels a cylindrical mass containing hair with rhythmic contractions, and returns to normal straight afterwards. In digestive vomiting the content is liquid or food, it repeats, and it is usually accompanied by loss of appetite or lethargy. This distinction cannot be settled at home; repeated vomiting warrants examination in any case.
Are hairballs dangerous?+
Most of the time the cat brings the mass up itself and the episode closes without incident. However, if the accumulation cannot move on through the digestive tract it may cause an obstruction, which requires emergency care. Retching without producing anything, stools stopping, a tense abdomen and a reaction to touch are findings that call for a vet without delay. In these cases examination is needed, not nutritional support.
Do short-haired cats get hairballs too?+
Yes. Coat length affects how much hair is swallowed but is not the only factor. A short-haired cat that over-grooms may produce hairballs more often than a long-haired cat that grooms little. So regardless of coat length, grooming frequency and the reason behind over-grooming are assessed; if stress or skin itching is driving the grooming, the real subject is not the hairball.
Does brushing reduce hairballs?+
Yes, and it is the cheapest method. Every tuft left in the brush is hair the cat has not swallowed. Two to three times a week is suggested for short-haired cats and daily for long-haired ones. Brushing also gives a regular chance to check the skin and coat. The effect is clearer when combined with increased water intake and balanced nutrition that supports healthy coat structure.