Pancytopenia in cats – signs and vet care

Updated 2026-09-30 · 1 sources

Based on: PDSA

Contact a vet today

Contact your vet today if you think your cat has this – it can become serious. It means your cat has dangerously low levels of red blood cells, white blood cells and platelets.

What to do now

What you can do now

Contact your vet
Note when it started, how often it happens and what else you see
Take a photo or short video to show the vet
Keep fresh water available
Let your cat rest somewhere calm

Don't

Do not give any human medicine
Do not wait if it gets worse

What it is

Pancytopenia means dangerously low levels of red blood cells, white blood cells and platelets.^[1] It is a rare problem that can quickly progress from vague, mild signs to severe and life-threatening illness.^[1] It can be caused by different conditions, including toxin exposure, certain infectious diseases and types of cancer.^[1]

Signs

Low energy or weakness
Not eating
Pale gums
Bleeding from the gums, nose, eyes, mouth, anus or vagina
Blood in the poo or pee
Blood in the vomit
Unexplained bruising
Repeated or severe infections
Fever
Collapse

Causes and risk factors

Something stops blood cell production
Something destroys blood cells
FeLV
FIV
Sepsis
Toxin exposure
Blood cancer
Bone cancer

How a vet finds out

Blood tests
Urine tests
Biopsy

How vets treat it

Antibiotics
Fluids or a drip
Blood transfusion
Medication

What the experts say

“Treatment for your cat’s pancytopenia depends on what’s caused it and how severely it’s affecting them. They will need treatment for their lack of blood cells, but also for the condition that has caused the cells to become depleted in the first place.”
— PDSA [1]

If your pet is struggling to breathe, has collapsed, is having a seizure or can't stand up: go to the nearest vet now.

Not sure how serious it is?

OkPaw asks a few quick questions about your pet and tells you in 30 seconds whether it can wait. Free on Google Play for Android.

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Common questions

What is pancytopenia?

Pancytopenia is when the body develops dangerously low levels of red blood cells, white blood cells and platelets.^[1]

How will a vet find out if my cat has pancytopenia?

Pancytopenia is usually diagnosed with a blood test called a complete blood count, which shows the number of each type of cell in the blood.^[1]

How might a vet treat pancytopenia?

Treatment depends on what caused it and how severely it is affecting your cat. A vet may treat the lack of blood cells and the condition that caused the cells to become depleted.^[1]

Sources

PDSA

How this page was made: written with the help of AI from the sources below, then checked claim by claim against those sources. Urgency levels follow OkPaw’s fixed safety rules. It is guidance, not a diagnosis. How we write our pages