PSSM is a disorder that causes muscle cramping in horses from abnormal glycogen (sugar) storage in the muscles. Sore muscles, muscle weakness and cramping are all signs of PSSM. …

PSSM in horses or Polysaccharide storage myopathy is a severe and inheritable glycogen storage disease characterized by muscle damage, stiffness, reluctance to move, and severe …

Apr 15, 2020 · Polysaccharide storage myopathy (PSSM) is a disease that results in an abnormal accumulation of glycogen (sugar) in the muscles. Clinical signs may include reluctance to …

Oct 29, 2025 · Polysaccharide storage myopathy, or PSSM, is a muscular disease that can affect horses. Because of its nature, it’s essential to gain knowledge about exactly what it can cause …

Equine polysaccharide storage myopathy (EPSM, PSSM, EPSSM) is a hereditary glycogen storage disease of horses that causes exertional rhabdomyolysis.

Horses that are managed properly can generally go on to have successful performance careers. Two types of PSSM have been classified: PSSM1 and PSSM2. The genetic test used by …

Oct 18, 2024 · This article will describe the signs and symptoms of PSSM and the two different types, explain options available to veterinarians to diagnose PSSM, and outline the use of diet …

Mar 4, 2025 · Polysaccharide Storage Myopathy (PSSM) affects horses’ muscles, causing issues with glycogen storage. It appears in two main types, each linked to different genetic mutations. …

Oct 17, 2022 · Dr. Jennifer Rice discusses PSSM in horses, including signs to look for and treatment options.

⚡️ A deep 2025 veterinary guide by Dr Duncan Houston on PSSM in horses: types, signs, testing, dietary/exercise management, and Ask A Vet support.