This disease primarily affects young sows, weaners and growers. The key clinical signs include a potbellied appearance; loss of weight; pale skin.

Background and history

This is a tumour affecting all the lymph glands throughout the body but particularly those of the intestines and lungs. The condition is very occasionally seen in the Large White breed, where a hereditary component is thought to be involved.

Reported levels of lymphosarcoma found at slaughter are extremely low (0.002 percent).

Clinical signs

  • Usually seen in young growing pigs.
  • Pale skin.
  • Sometimes slightly jaundiced.
  • Loss of weight.
  • Potbellied appearance – abdomen distended.
  • Enlarged glands may be seen in the neck.
  • Most pigs die within 4–5 months.


This is based on clinical tests confirmed by post mortem examinations.


The causes are unknown but it is thought to be associated with a virus and genetic predisposition.


There is no treatment. Destroy affected pigs