Cat Pacing at Night: Pain, Thyroid and 20-Minute Rule

A cat that walks the same 4-meter line for 20 minutes or more, on 3 nights out of 7, is not bored. In cats over 8 years old the first 2 suspects are pain and an overactive thyroid, and both are cheap to test: a total T4, a blood pressure reading, and a 10-minute oral exam. Pacing that starts suddenly, or after a fall from 1.5 m or more, gets a clinic visit within 72 hours.

Normal adult activity runs in bursts of 5 to 10 minutes, 12 to 20 times a day, with 12 to 16 hours of sleep. What matters is change. A cat that slept 16 hours a day for 6 years and now covers 200 meters of floor between 1 a.m. and 4 a.m. has a reason, and it is rarely behavioral.

What counts as abnormal pacing

3 numbers make the call: 20 minutes in one stretch, 3 nights out of 7, and 4 weeks of slow drift before most owners notice. Count laps, not distance. A cat that crosses the room 30 times in 20 minutes, stops at the same 2 corners, and vocalizes 5 or more times is showing a pattern, not a mood.

Film 60 seconds on your phone at floor level. Gait, tail carriage and head position read better on video than in a 10-minute description in the exam room. Note 3 things: whether the cat walks on tiptoe, whether the back is arched, and whether 1 hind leg lags behind the other.

Pain first: 4 places to look

Pain is the most common cause of new restlessness in cats, and cats do not limp or cry for it. Check these 4 sites before you consider a behavior label. A sore mouth also explains bad breath, which is worth a separate read: bad breath in cats.

• Mouth. Resorptive lesions and periodontal disease are common from age 3. Signs: chewing on 1 side, dropping kibble, jaw chattering, drooling. A dental exam under sedation with full-mouth x-rays is the only way to see roots.
• Abdomen. A tense belly, a cat that hunches over the water bowl, 12 hours of picking at food. Palpation plus an fPL and an ultrasound answers most of it inside 24 hours. A hard, swollen belly is its own emergency: bloated abdomen.
• Lower back. Spondylosis and disc pain show up as a refusal to jump onto a 40 cm sofa, a low tail, and pacing because lying down hurts.
• Joints. Hip and elbow arthritis: a 3-second pause before a jump, stiffness for the first 10 minutes after rest, and less grooming than 6 months ago. Many vets find radiographic osteoarthritis in most cats over 12.

Thyroid: 3 numbers, 1 blood test

Hyperthyroidism lifts metabolic rate, so the cat paces, yowls at night, eats 80 g a day and still loses 300 g in 6 weeks. The trio to bring to the vet is a resting heart rate above 220 bpm, a total T4 above the lab ceiling (often 4.0 µg/dL or 52 nmol/L), and a weight drop of 10% in 3 months.

A single normal T4 does not exclude it. If the heart rate stays at 200 or higher, ask for a free T4 or a repeat in 4 to 6 weeks. Blood pressure belongs in the same visit: systolic above 160 mmHg on 2 of 3 readings needs treatment, and untreated hypertension can blind a cat within weeks.

The 7-night log

Take 5 numbers twice a day, at 8 a.m. and 8 p.m., for 7 nights. A $25 baby scale, a $12 digital thermometer and a 30-second heart count with a hand on the chest cover it. Bring the sheet, not the story.

Night	Pacing (min)	Resting HR (bpm)	Temp (°C)	Food eaten (g of 70)
1	15	168	38.4	65
2	25	176	38.6	55
3	40	190	38.9	35
4	35	184	38.7	40
5	50	196	39.0	25
6	45	188	38.8	30

2 rows in a row with pacing over 30 minutes and a heart rate over 200 bpm earns a same-week appointment. A temperature of 39.5°C or higher, or below 37.5°C, is a same-day call. Weight falling 5% in 7 days is a third trigger, measured at the same time each day, before the first meal.

Light, litter and the 12-year-old brain

Cognitive dysfunction usually starts between 11 and 13 years and looks like night waking, yowling at 3 a.m., and staring at a wall for 10 minutes. 3 changes help within 2 weeks: a 20-watt warm lamp left on until 11 p.m., the last meal moved from 6 p.m. to 9 p.m., and 10 minutes of food-puzzle play before bed.

Keep 2 litter boxes, 1 per floor, scooped twice a day. A cat that holds urine because the box is 2 floors away will pace instead, and a male cat with 12 hours of no urine is an emergency, not a habit. Check the room for toxins as well: permethrin flea drops made for dogs, 1 plug-in diffuser per 10 m² of essential oil, and lily pollen on a table all produce sudden restlessness and drooling. Run the list before you blame temperament: toxic exposure check.

When you must see a vet

• Pacing 20 minutes or more on 3 nights in 7, with no obvious trigger.
• Open-mouth breathing, or more than 60 breaths a minute at rest.
• Temperature at or above 39.5°C, or at or below 37.5°C.
• No food for 24 hours, or no urine for 12 hours in a male cat.
• Pacing plus a new head tilt, circling, or a pupil that stays wide in a lit room.
• Weight down 10% in 3 months, with a normal appetite.

Any 1 of these 6 is a same-day or next-day visit. A cat that cannot settle for 2 hours and also vomits 2 or more times needs the emergency clinic tonight.

Tonight, in order

1. Close the doors to 2 rooms and watch where the cat walks; the route points at the sore part.
2. Start the log tonight, 5 numbers, 2 times a day, for 7 nights.
3. Give 10 minutes of wand play at 9 p.m., then a small meal at 9:30 p.m.
4. Weigh the cat before breakfast, on the same scale, and write it down.
5. Book a visit if the log shows 3 bad nights, and ask for T4, blood pressure and an oral exam in 1 appointment.

Restlessness is one of the few signs where 7 days of numbers beats 7 weeks of guessing. Most cats that pace at night have 1 of 3 problems, and all 3 are visible in a $120 workup.

Terms mentioned in this article

T4

Frequently asked