Pig Tremors: Causes of Shaking, Weakness & Neurologic Warning Signs

Tremors in pigs can come from several body systems, so the pattern matters. In piglets, congenital tremor syndrome is a well-known cause of whole-body shaking that starts very early in life. Merck notes congenital tremors are often linked to atypical porcine pestivirus, and affected piglets may have intention tremors that are most obvious when they try to stand, nurse, or move. Other infectious neurologic diseases in young pigs can also cause tremors, weakness, and abnormal behavior.

Metabolic and husbandry problems are also important. Merck lists inanition or hypoglycemia as causes of weakness and coma in suckling piglets, and sodium toxicity from water deprivation or excess salt can progress to weakness, tremors, seizures, blindness, circling, and coma. In pet pigs of any age, poor intake, dehydration, sudden feed changes, or limited water access can turn a mild problem into an emergency quickly.

Toxins and stress-related muscle disorders are another group to consider. Organophosphates and other insecticides can cause tremors and convulsions. Porcine stress syndrome or malignant hyperthermia can cause abrupt shaking, muscle rigidity, panting, red blotchy skin, overheating, and collapse, especially with exertion or certain anesthetic triggers. Pain, trauma, fever, and severe weakness can also look like "shaking," so your vet will need the full history to sort out what is really happening.

See your vet immediately if your pig has tremors plus weakness, trouble standing, repeated falling, seizures, paddling, circling, blindness, vomiting, blue or pale gums, heavy breathing, collapse, or a very high or very low body temperature. These signs can fit toxin exposure, salt toxicity, hypoglycemia, overheating, severe infection, or a primary neurologic problem. Piglets deserve especially fast attention because they have less reserve and can become critically ill in hours.

A same-day urgent visit is also the right choice if the shaking is new, keeps happening, is getting worse, or is paired with poor appetite, not drinking, diarrhea, weight loss, or behavior changes. If a pregnant sow was exposed to certain chemicals during gestation, congenital tremors in a litter should also be discussed with your vet promptly.

Home monitoring is only reasonable for a bright, alert pig with a brief, mild tremor episode that stops quickly and has no weakness, no breathing changes, no toxin concern, and normal eating and drinking. Even then, keep a close log of timing, triggers, temperature if your vet has shown you how to take it safely, appetite, water intake, urination, stool, and video of the episode. If anything changes, move from monitoring to veterinary care right away.

Your vet will start with triage. That usually means checking temperature, heart rate, breathing, hydration, gum color, mentation, and whether your pig can stand and swallow safely. A neurologic exam may include watching gait, checking posture, looking for head tilt or circling, and assessing whether the tremor happens at rest or during movement. History is very important, including age, diet, water access, recent stress, medications, insecticide exposure, feed changes, and whether other pigs are affected.

Initial testing often includes blood glucose, packed cell volume or basic bloodwork, electrolytes, and sometimes blood gas testing, depending on the setting. If salt toxicity, toxin exposure, infection, or muscle injury is suspected, your vet may recommend more targeted lab work. In piglets or herd situations, PCR or other diagnostic testing may be used when congenital tremor syndromes or infectious neurologic disease are concerns.

Treatment depends on the cause and how sick the pig is. Stabilization may include warming or cooling support, oxygen, IV or intraosseous fluids, dextrose for low blood sugar, seizure control, pain relief, and careful correction of electrolyte problems. If a toxin is possible, your vet may recommend decontamination, hospitalization, and monitoring for complications. Some pigs improve with supportive care, while others need intensive monitoring because neurologic signs can progress quickly.

Home care should only happen after speaking with your vet if the tremors are mild and your pig is otherwise stable. Keep your pig in a quiet, padded, low-stress area away from stairs, slick floors, and other animals that may bump or chase them. Make sure fresh water is always available unless your vet gives different instructions. If your pig is weak, place food and water within easy reach and use shallow bowls to reduce effort.

Do not give human medications, electrolyte products, or supplements unless your vet specifically recommends them. If toxin exposure is possible, remove access to feed, chemicals, slug bait, insecticides, treated bedding, or contaminated water, and bring packaging or photos to the appointment. If your pig is overheating, move them to a cooler area while arranging urgent veterinary care. If they seem chilled, provide gentle warmth, but avoid overheating and do not force-feed a weak pig that may not be swallowing normally.

Track appetite, water intake, urination, stool, body temperature if your vet has shown you how, and whether the tremors happen at rest or with movement. Video can be very helpful. If your pig becomes weaker, stops eating, has a seizure, cannot stand, or seems unaware of surroundings, stop home care and seek emergency veterinary help immediately.