How big is your burmese ? whats your temps and humidity. I have a male reticulated python aprox 10ft i thought the same thing i took him in and said he was healthy. Ive read up on it and read some topics due to the snakes sher size you can sometimes hear them breathing. I had a 8ft+ female redtail that would do it as well and she was really healthy. but it never hurts to be on the safe side id get a vet check if at all possible.