High Blood Pressure in Cats: What Every Cat Parent Should Know
If there’s one condition we wish more cat parents knew about, it’s hypertension. Unlike in dogs, high blood pressure in cats is genuinely common — especially in cats over 10 — and it’s one of the few conditions in veterinary medicine where missing the diagnosis can cause sudden, irreversible blindness. The encouraging part is that checking for it is quick, painless, and something we can build right into a senior wellness visit.
What Is Hypertension, and Why Does It Matter So Much in Cats?
Blood pressure is the force of blood against artery walls. When it stays elevated over time, it damages small, delicate blood vessels throughout the body — and cats have a particular vulnerability in their eyes. The blood vessels in the retina are thin and easily injured by sustained high pressure, which can lead to retinal detachment and sudden blindness, sometimes without any warning signs beforehand. Hypertension can also worsen kidney disease, strain the heart, and affect the brain.
Because of this risk to vision, we consider blood pressure screening a core part of senior cat care — not an optional add-on.
What Causes High Blood Pressure in Cats?
The overwhelming majority of hypertension cases in cats are secondary — meaning there’s an underlying disease driving it. The two big ones we watch for are:
- Chronic kidney disease (CKD). Extremely common in senior cats, CKD disrupts the normal systems that regulate blood pressure, and the two conditions often occur together and worsen each other.
- Hyperthyroidism. An overactive thyroid gland revs up the whole cardiovascular system, including blood pressure. Hyperthyroidism is one of the most common hormonal diseases we diagnose in older cats.
Less commonly, we see hypertension linked to:
- Diabetes mellitus
- Primary aldosteronism (a less common adrenal gland disorder)
- Idiopathic hypertension — elevated pressure with no identifiable cause, which does happen in cats, though less often than the causes above
Because CKD and hyperthyroidism are both silent in their early stages, regular senior bloodwork (ideally starting around age 7, and more frequently after 10) gives us the best shot at catching either one — and the hypertension that may come with it — before real damage is done.
How We Diagnose Hypertension in Cats
Blood pressure measurement. We use a Doppler ultrasonic device with a small cuff, usually placed on a front leg or the tail. It’s non-invasive and typically takes just a few minutes in a quiet room.
A calm approach matters. Cats are notoriously sensitive to stress, and a stressed cat can show temporarily elevated readings that don’t reflect their true baseline. We take multiple readings, let the cat settle, and use a consistent, gentle technique — often in a cat-only exam room, away from barking and unfamiliar scents — to get the most accurate picture.
Bloodwork and urinalysis. Since CKD and hyperthyroidism are the leading causes, a full chemistry panel, complete blood count, urinalysis, and thyroid hormone (T4) level are standard parts of the workup.
Eye exam. We always check the retina for early signs of hypertensive damage — things like bleeding, swelling, or changes in blood vessel appearance — which can sometimes appear before the cat shows any visible symptoms at home.
Additional testing when needed. Depending on findings, we may recommend an abdominal ultrasound or additional hormone testing to further characterize kidney or adrenal function.
Have questions? Call us today or book an appointment online!