When a cat is not healthy, he usually changes his behavior and it’s not hard to notice he is in pain. Sick cats tend to isolate themselves, they may become violent when touching them, especially if they are being touched in a sore spot, they can bite or scratch.
Here are a few more signs you need to be aware of: 
- Lake of appetite or excessive drinking of water.
- Regurgitation of food.
- Lethargy, poor balance.
- Retching or vomiting.
- Weight loss.
- Change or problem with urinating or defecating.
- Excessive vocalization.
When any of these signs appear, don’t hesitate to take your cat as soon as possible to the vet.
