Final answer:
A common symptom of coccidia in kittens is diarrhea, which is a gastrointestinal issue that can lead to more severe health problems if not treated by a veterinarian.
Step-by-step explanation:
A common symptom of coccidia in kittens is Diarrhea. Coccidia is a type of parasitic disease caused by microscopic organisms that infect the intestinal tract of kittens and can lead to various gastrointestinal symptoms. Other related symptoms from different parasitic infections can include abdominal pain, nausea, weight loss, and fatigue. When it comes to kittens and other young animals, the parasite toxicity can be particularly harmful, and quick veterinary attention is recommended if these symptoms are observed.