My guinea pig is limp, having spasms, and seems to be seizing.
I'm so sorry that Cam is sick. I sincerely apologize that no one has responded to your question and it has been 4 days. I hope he has survived.
Some things that could cause those signs are nutritional deficiency (like vitamin C), liver shunt, ear infection, head trauma, and even parasites (like mites).
What you are describing almost sounds like seizures. True seizures are rare in guinea pigs although possible. If your guinea pig cries out, falls to one side, and starts twitching, it is most likely infected with a skin parasite known as guinea pig mange (Trixicara cavis). The seizure-like behavior is due to the intense itching sensation caused by the mites burrowing through the skin. The mites are microscopic and you would not be able to see them with your eyes.
He needs to be seen by a vet because those mites (if he does have them ) are easy to treat with the proper medication.
I hope this helps. Best wishes!
Updated on September 23rd, 2025