Jaundice in Pigs: Yellow Skin, Yellow Eyes, and Liver Disease

Jaundice, also called icterus, means bilirubin has built up in the body enough to turn tissues yellow. Bilirubin is a yellow pigment made when red blood cells are broken down. In pigs, the yellow color may be easiest to notice in the whites of the eyes, gums, inner ears, skin, or other lightly pigmented tissues.

Jaundice is not a disease by itself. It is a visible clue that something deeper is going on. In pigs, that may include liver inflammation, liver failure, bile flow obstruction, toxin exposure, severe infection, or rapid red blood cell destruction. Merck notes that pigs with fumonisin-related liver toxicosis can develop icterus along with poor growth and abnormal liver values, and aflatoxin exposure can also cause icterus and liver injury.

Because pigs can hide illness until they are quite sick, yellow discoloration should be taken seriously. Some pigs also show vague signs first, such as reduced appetite, slower growth, weakness, or acting less social. Your vet can help sort out whether the problem is primarily in the liver, blood, or biliary system.

If your pig is also weak, breathing hard, not eating, vomiting, unable to stand, or has a swollen belly, the situation is more urgent. Those signs can mean the underlying cause is severe and may need same-day veterinary care.

Jaundice in pigs usually falls into three broad categories: before the liver, in the liver, or after the liver. Before the liver means bilirubin is rising because red blood cells are being destroyed faster than normal. In the liver means the liver cells themselves are inflamed, damaged, or failing. After the liver means bile cannot move normally through the biliary system.

In pigs, important liver-related causes include mycotoxin exposure, especially aflatoxins and fumonisins in contaminated feed. Merck reports that aflatoxicosis can cause depression, poor growth, hemorrhage, icterus, and death, and that pigs exposed to fumonisins can develop hepatotoxicosis with increased bilirubin, AST, and GGT. Other possible causes include infectious disease, severe inflammation, congenital liver problems, and less commonly biliary obstruction.

Some pigs become jaundiced because of red blood cell breakdown rather than primary liver disease. Toxins, certain poisonings, and severe systemic illness can contribute. In newborn piglets, iron toxicosis is one example that can include icterus along with weakness and rapid decline.

A careful history matters. Your vet will want to know the pig's age, diet, recent feed changes, access to moldy grain, medications or supplements, exposure to standing water or wildlife, whether other pigs are sick, and how quickly signs developed. Those details often help narrow the list of likely causes.

Diagnosis starts with a full physical exam and a close look at the pattern of illness. Your vet will check whether the yellow color is true jaundice, assess hydration, temperature, body condition, abdominal comfort, and look for clues such as bruising, pale tissues, or breathing changes. In herd situations, your vet may also ask about feed storage, recent weather, and whether multiple pigs are affected.

Bloodwork is often the next step. Merck notes that in farm animals, tests such as bilirubin, GGT, and other serum enzyme activities are useful indicators of liver disease, although they do not fully measure liver function by themselves. A CBC can help look for anemia, inflammation, or evidence of red blood cell destruction. Chemistry testing may show elevated bilirubin and liver-associated enzymes. Urinalysis, fecal testing, and clotting tests may also be recommended depending on the case.

If toxin exposure is possible, your vet may suggest feed testing for mycotoxins and a review of storage conditions. Imaging such as ultrasound can sometimes help assess liver size, texture, fluid in the abdomen, or possible biliary problems. In select cases, liver biopsy, necropsy of a deceased herd mate, or referral diagnostics are needed to confirm the cause.

Because jaundice is a sign with many possible causes, the goal is not only to confirm bilirubin buildup but to identify why it is happening. That answer guides treatment options and helps your vet give a more realistic outlook.

Prevention focuses on reducing the most common underlying triggers rather than preventing the yellow color itself. One of the biggest steps is feed safety. Store grain and feed in dry, clean conditions, rotate stock, and avoid feeding anything that smells moldy, looks caked, or has been exposed to moisture. This matters because aflatoxins and fumonisins are well-recognized causes of liver injury in pigs.

Good herd health also helps. Work with your vet on vaccination, parasite control, sanitation, rodent control, and water management. If leptospirosis is a concern in your area or setup, your vet may recommend specific prevention steps because leptospires can affect the liver and kidneys and are also zoonotic.

For pet pigs and small backyard groups, avoid unsupervised access to medications, supplements, chemicals, and ornamental plants. Use iron products and other supplements only as directed by your vet, especially in piglets, because overdosing can be dangerous.

Finally, act early when something seems off. Reduced appetite, slower growth, or a sudden change after a feed switch can be the first clue of liver trouble. Prompt veterinary attention may help limit damage, protect other pigs, and improve the chance of recovery.