Most cats with well-managed diabetes are not in significant pain from the disease itself. But diabetes can cause nerve damage, dental disease, and urinary infections that do produce real discomfort, and cats are notoriously good at hiding it. Whether your cat is hurting depends largely on how long blood sugar has been elevated and whether complications have developed.
How Diabetes Causes Nerve Pain
The most direct source of pain in a diabetic cat is peripheral neuropathy, a type of nerve damage caused by prolonged high blood sugar. When glucose stays elevated for weeks or months, the protective coating around nerve fibers begins to break down. The blood vessels supplying those nerves also thicken, with studies showing a 73% increase in vessel wall thickness in diabetic cats compared to healthy ones. Over time, this leads to actual loss of nerve fibers in the limbs.
About 8 to 10% of diabetic cats develop the classic visible sign of this damage: a plantigrade stance, where the cat walks flat on its hocks (the joint midway up the back leg) instead of up on its toes. The cat looks like it’s walking on its “heels.” This is often accompanied by weakness in the back legs, muscle wasting, and reduced reflexes. Another 10% of diabetic cats show general stiffness or mobility problems that may not be as dramatic but still reflect nerve or joint involvement.
Whether neuropathy is painful or simply causes weakness and clumsiness is harder to pin down. In humans, diabetic neuropathy frequently involves burning, tingling, and shooting pain. Cats can’t describe these sensations, but veterinary researchers studying the sensory profile of affected cats believe similar discomfort is likely. The nerve damage involves the same types of fibers, both the large ones controlling movement and the small ones carrying pain signals.
Signs Your Cat May Be in Pain
Cats don’t whimper or cry out the way dogs might. Instead, pain shows up as subtle changes in behavior and facial expression. The Feline Grimace Scale, a validated tool used by veterinarians, identifies five key indicators of pain in cats:
- Ear position: The ears rotate outward and flatten slightly, increasing the distance between the ear tips.
- Eye squinting: The eyes narrow or partially close, a sign called orbital tightening.
- Muzzle tension: The area around the nose and mouth looks tight or bunched rather than relaxed.
- Whisker position: Whiskers push forward and stiffen instead of resting loosely to the sides.
- Head position: A painful cat tends to hold its head lower than normal or tuck it toward the body.
Beyond facial cues, watch for reluctance to jump, difficulty using the litter box, reduced grooming (leading to a dull or matted coat), hiding more than usual, loss of appetite, or irritability when touched, especially along the back legs. A cat that used to leap onto the couch and now hesitates or avoids it entirely may be dealing with discomfort it can’t tell you about.
Dental Disease: A Hidden Pain Source
Diabetes and dental disease appear to be linked in cats, though researchers are still working out the exact relationship. One study of Burmese cats found dental disease requiring treatment was a risk factor for developing diabetes. More importantly for your question, periodontal disease, tooth resorption, and broken teeth are frequently overlooked sources of significant pain in cats.
Gum inflammation progresses to chronic oral infection, and eventually tooth loss. This process is painful at nearly every stage. Diabetic cats may be especially vulnerable because high blood sugar impairs the immune response and promotes bacterial growth. Veterinarians have noted that glycemic control often improves in diabetic cats after dental treatment, sometimes enough to reduce insulin doses. That improvement likely reflects the removal of a chronic infection, but it also means the cat was carrying an untreated source of pain that was making the diabetes harder to manage.
Urinary Tract Infections
Sugar-rich urine creates a favorable environment for bacteria, and urinary tract infections are common in diabetic cats. In one study of 141 diabetic cats, about 13% had a confirmed urinary infection. These infections cause discomfort you might recognize as frequent trips to the litter box, straining to urinate, crying during urination, or urinating outside the box. Some cats lick excessively at their lower belly.
What makes this tricky is that urinary infections in diabetic cats can persist regardless of how well the diabetes is controlled. Routine monitoring through urine tests is the most reliable way to catch them, since some cats with infections show no obvious symptoms at all.
What Helps and What to Expect
The single most important thing for reducing pain in a diabetic cat is getting blood sugar under control. When glucose levels stabilize, nerve damage can partially reverse. Cats are actually better at nerve regeneration than humans in this regard, and some cats with plantigrade stance will return to a normal gait once their diabetes is well managed, though this can take weeks to months.
Vitamin B12 supplementation is sometimes used to support nerve health in diabetic cats. In human studies, both standard and active forms of B12 have shown benefits for neuropathy symptoms like pain and tingling. The evidence in cats is mostly anecdotal, but many veterinarians recommend it as a low-risk addition to treatment. Typical protocols involve weekly injections for several weeks, followed by less frequent dosing.
For dental pain, professional cleaning and extraction of damaged teeth can make a dramatic difference in comfort and may even improve diabetic control. Urinary infections are treated with antibiotics, but recurrence is common in diabetic cats, so periodic urine checks help catch new infections before they cause significant discomfort.
Some cats with diabetes live comfortably for years with no apparent pain, especially when diagnosed early and managed consistently. The cats most at risk for pain are those with uncontrolled or long-standing high blood sugar, where complications have had time to develop. If your cat’s diabetes is newly diagnosed and you’re starting treatment, the outlook for avoiding pain-related complications is genuinely good.