Pig Testicle Swelling: Injury, Infection or Hernia?

Testicular or scrotal swelling in pigs usually comes from one of a few categories: injury, infection/inflammation, or hernia. Trauma can happen after rough play, mounting, falls, bites, or contact with fencing and housing equipment. In boars, the Merck Veterinary Manual notes that the testicles are vulnerable to trauma and that the initial reaction to trauma or infection is swelling. If swelling is ignored, long-term damage and shrinkage of the testicle can follow.

Infection or inflammation may involve the testicle itself (orchitis) or nearby structures such as the epididymis. The area may feel warm, painful, or firm, and your pig may walk stiffly, resent handling, or stop eating. In breeding pigs, infectious causes can include diseases such as Brucella suis, which Merck lists as a cause of orchitis in pigs. Because some infectious diseases in pigs can affect people, avoid squeezing, lancing, or handling draining material without veterinary guidance.

An inguinal or scrotal hernia is another important cause, especially in miniature pet pigs and younger intact males. Merck notes that inguinal hernias are common in miniature pigs, and a hernia may appear as a one-sided swelling in the groin or scrotal area. Some hernias stay soft and nonpainful at first, but if intestine becomes trapped, the swelling can become painful and urgent.

If your pig was recently castrated, mild postoperative swelling can happen, but marked enlargement, heat, discharge, bad odor, bleeding, or worsening pain is not normal. Less common possibilities include fluid pockets such as a seroma, abscess formation, or a mass. Your vet may need an exam and sometimes imaging to tell these apart.

A small amount of mild swelling after a recent procedure may be monitored briefly only if your vet has already examined your pig, the swelling is not getting larger, and your pig is bright, eating, walking normally, and comfortable. Even then, close observation matters. Take photos once or twice daily so you can track whether the area is stable, improving, or worsening.

See your vet the same day if the swelling is new, one-sided, painful, warm, red, firm, or your pig resists movement or cries when the area is touched. Same-day care is also wise if there is any discharge, foul smell, fever, reduced appetite, or if the swelling developed after trauma or a recent castration.

See your vet immediately if the swelling enlarges quickly, becomes dark purple or black, feels very tight, or your pig is weak, lethargic, vomiting, straining to urinate or defecate, breathing hard, or refusing food. Those signs raise concern for a strangulated hernia, severe infection, bleeding, or tissue damage. Pigs can hide pain, so a pig that suddenly isolates, stops rooting, or will not get up deserves urgent attention.

Do not try to push a swelling back in, puncture it, apply human creams, or give over-the-counter pain medicines unless your vet specifically tells you to. Many human medications are unsafe in pigs, and home treatment can delay care or make surgery harder if a hernia or abscess is present.

Your vet will start with a hands-on exam and a careful history. Expect questions about your pig’s age, whether he is intact or previously castrated, when the swelling started, whether it changed suddenly, any recent trauma, breeding activity, appetite changes, stool and urine habits, and whether the swelling feels soft, firm, or painful at home.

On exam, your vet will assess the size, symmetry, consistency, heat, and pain level of the testicles and scrotum. That approach matches Merck’s guidance for examining boars, which emphasizes checking for symmetry and pathologic changes. Your vet may also palpate the inguinal area to look for a hernia and evaluate whether the swelling seems reducible, fluid-filled, inflamed, or solid.

Depending on findings, diagnostics may include ultrasound to distinguish hernia from fluid, abscess, or testicular disease; needle sampling or culture if infection is suspected; and bloodwork if your pig seems systemically ill or may need sedation or surgery. If a contagious reproductive infection is a concern, your vet may recommend additional testing and biosecurity precautions.

Treatment depends on the cause. Options may include pain relief, anti-inflammatory medication, restricted activity, antibiotics when bacterial infection is likely, wound care, drainage of an abscess, or surgery. Surgery may involve castration, removal of damaged tissue, or hernia repair if abdominal contents are entering the scrotum. Your vet will tailor the plan to your pig’s comfort, breeding status, overall health, and your goals.

Home care should support your pig while you arrange veterinary guidance, not replace it. Keep your pig in a clean, dry, well-bedded area with good footing and limited climbing, rough play, or mounting activity. If you have multiple pigs, temporary separation may help prevent bumping or bullying. Check the swelling at least twice daily for changes in size, heat, color, discharge, or pain.

Offer normal food and fresh water, and watch closely for appetite changes. In pigs, reduced interest in food, less rooting, hiding, or reluctance to stand can be early pain signs. If your pig was recently castrated or treated, follow your vet’s instructions exactly for incision care, medication timing, and recheck visits.

Do not squeeze the swelling, try to drain it, or attempt to push a suspected hernia back in. Avoid wraps unless your vet specifically recommends one. Do not use human pain relievers, antibiotic ointments, or leftover livestock medications without veterinary direction, because dosing and safety vary and some products can worsen tissue damage.

Call your vet sooner if the swelling gets larger, becomes firmer, hotter, darker, or more painful, or if your pig stops eating, seems weak, vomits, strains, or develops discharge. Those changes can mean the problem is moving from monitorable to urgent.