Burmese Cat Health: Hypokalaemia, GM2 & Flat-Chested Kittens

By Sarah Bennett, Certified Animal Nutritionist

The Burmese is a compact, muscular cat with a warmly expressive face, short glossy coat, and an intensely social personality. Often described as the "dog of the cat world" for their loyalty, their habit of following owners from room to room, and their willingness to be carried, Burmese form deep, lasting bonds with their human families. They are also among the longest-lived pedigree cats — healthy, well-cared-for individuals regularly reach 16–18 years. That long life, however, comes with a set of specific hereditary vulnerabilities that prospective and current owners must be equipped to manage. From a fatal neurological disease to a neonatal structural deformity and an unusual electrolyte disorder, Burmese health requires knowledgeable, proactive care.

Hypokalaemia (Familial Episodic Hypokalaemic Polymyopathy)

Hypokalaemia — abnormally low blood potassium levels — causes one of the most striking and distressing conditions seen in Burmese cats. Known formally as Familial Episodic Hypokalaemic Polymyopathy, this hereditary condition manifests as episodes of generalised muscle weakness. Affected cats suddenly appear unable to hold their head upright (ventroflexion of the neck is characteristic), walk with a stiff or stumbling gait, or may seem profoundly weak across their entire body during an episode.

The condition arises because low serum potassium disrupts the electrical potential across muscle cell membranes, impairing normal muscle contraction. Episodes may be triggered by stress, exercise, or dietary changes and typically last from hours to several days. In severe cases, cardiac arrhythmias can develop — potassium is critical for normal heart rhythm.

The genetic basis involves a mutation that disrupts potassium transport or renal potassium retention. A DNA test has been developed for the associated mutation in some Burmese lines. Treatment during an episode involves potassium supplementation — oral potassium gluconate for mild cases, or intravenous potassium administration under veterinary monitoring for severe episodes. Cats with confirmed hypokalaemia are managed long-term on potassium supplementation and dietary adjustment, with regular blood panel monitoring of serum potassium. Prognosis with appropriate management is generally good, though the condition is lifelong.

GM2 Gangliosidosis: A Fatal Neurological Disease

GM2 Gangliosidosis is a lysosomal storage disease caused by a deficiency of the enzyme hexosaminidase A or B. Without these enzymes, GM2 ganglioside — a lipid — accumulates progressively in neurons throughout the central nervous system, causing irreversible neuronal death. In Burmese cats, a specific mutation has been identified and a DNA test is available.

GM2 Gangliosidosis follows autosomal recessive inheritance. Affected kittens appear clinically normal initially but begin showing progressive neurological deterioration from approximately 5–7 months of age. Signs include intention tremors (shaking when attempting purposeful movement), cerebellar ataxia (loss of balance and coordination), difficulty eating and swallowing, hindlimb weakness progressing to paralysis, and eventually complete neurological failure. The disease is invariably fatal — most affected kittens are humanely euthanised for welfare reasons by 12–15 months of age.

There is no treatment and no cure for GM2 Gangliosidosis. Prevention is entirely through DNA testing of breeding cats and elimination of carrier-to-carrier pairings. Responsible Burmese breeders test every cat in their programme. When acquiring a Burmese kitten, request documented GM2 DNA test results for both parents. A kitten whose parents are both tested clear cannot be affected.

Flat-Chested Kitten Syndrome (FCKS)

Flat-Chested Kitten Syndrome (FCKS) is a neonatal structural deformity in which the thorax is dorsoventrally flattened — the ribcage is compressed rather than having its normal rounded cross-section. Severely affected kittens cannot expand their lungs adequately, leading to respiratory distress and difficulty nursing. Mildly affected kittens may have only a subtle flattening and recover spontaneously as the ribcage develops normal shape with growth.

FCKS has been documented in several breeds including Burmese, Bengals, and Birmans. The aetiology is not fully understood but is believed to involve a combination of genetic predisposition and environmental/nutritional factors during pregnancy. Some researchers have proposed links to low taurine status in the queen during gestation, though this has not been definitively established.

Management of affected kittens requires intensive neonatal support: positioning kittens on their sternum and sides (not their back) to maximise thoracic expansion; supplemental tube feeding if nursing is impaired; warmth maintenance; and regular veterinary assessment of respiratory function. Severely affected kittens may require gentle chest physiotherapy. Breeders who have experienced FCKS in a litter should discuss the case with their vet to explore potential nutritional or management interventions in future pregnancies.

Congenital Peripheral Vestibular Disease

Congenital peripheral vestibular disease has been reported in Burmese kittens. The vestibular system controls balance and spatial orientation, and affected kittens present from birth or shortly after with a head tilt, rolling, falling, and horizontal nystagmus (rhythmic involuntary eye movements). Unlike acquired vestibular disease in adult cats, the congenital form in Burmese kittens often improves significantly with age as the central nervous system compensates. Many affected kittens go on to live relatively normal lives, though a residual head tilt is common. Any kitten showing vestibular signs should receive a full neurological evaluation to distinguish congenital vestibular disease from other neurological conditions.

Diabetes Mellitus: A Growing Risk in Middle Age

Burmese cats have a significantly elevated risk of developing Type 2 diabetes mellitus compared to most other breeds — multiple studies have identified Burmese as among the highest-risk breeds for feline diabetes. Risk factors include obesity, male sex, advancing age (most cases present in cats over 7), indoor lifestyle, and neutering. Signs of diabetes include markedly increased thirst and urination, weight loss despite good appetite, and progression to weakness (particularly plantigrade stance — walking on the hocks rather than the toes, due to diabetic neuropathy).

Diabetes in cats is often manageable and in some cases achievable remission is possible with early, aggressive treatment — particularly a high-protein, low-carbohydrate diet combined with twice-daily insulin injections. Weight management is the most powerful preventive measure. A lean Burmese has substantially lower diabetes risk than an overweight one. Monitor body weight at every vet visit and maintain an ideal body condition score throughout life.