Understanding myopathies in cats — muscle diseases that cause pain, weakness, and reduced quality of life.
Feline myopathies cause significant welfare impairment through pain, weakness, and loss of normal mobility. Hypokalemic myopathy — typically seen in cats with chronic kidney disease or on low-potassium diets — causes acute severe muscle weakness. Affected cats cannot lift their heads (ventroflexion), cannot rise normally, and are profoundly weak. The acute onset can be frightening for both cat and owner.
Immune-mediated polymyositis causes painful muscle inflammation — affected cats show reluctance to move, muscle tenderness on palpation, and progressive weakness. The pain of active inflammation significantly reduces quality of life. Devon Rex cats have a hereditary myopathy affecting their distinctive muscle composition.
The reversibility of the condition depends on the cause. Hypokalemia responds rapidly to potassium supplementation with dramatic welfare improvement. Immune-mediated conditions require sustained immunosuppressive therapy. Hereditary myopathies are managed supportively.