How can I tell if my veiled male is sick?

[Austybear]

I need some help identifying symptoms of sickness in veiled chameleons, I know most of them I just want to make sure he's not sick so I can start building his new cage.

 

[kinyonga]

Symptoms can include but are not limited to....lethargy, sitting low in the cage, eyes shut during the day, not eating, excessive drinking, sitting with its mouth open when not due to heat, bent arms/legs, sores on the body or edges of the mouth.....etc.....etc....etc....

The list is too long and it depends on what the sickness is.