Moulting is a very uncomfortable experience for snakes and they will often fast for several weeks before and after a moult. Typically the larger the snake, the longer it will fast for.

Keep an eye on tell-tale signs such as eyes clouding over or your snake not coming out of his hide for days if not weeks on end. You may be able to see sloughed bits of skin around the cage indicating a recent moult.

Generally within a week or two after a moult your snake will commence feeding again.

Some more fussy snakes will for no obvious reason sometimes stop feeding the reptile food simply because they're getting bored with what you're feeding, the similar snake food / reptile food. So try "mixing it up" a little. Feeding mice? Try gerbils or hamsters. Try a different time of day, or size of prey item.

4) Not Stimulating

Sometimes a prey item you give simply won't "do it" for your snake. It won't elicit the feeding response. It may be that the prey item isn't warm enough (many snakes, such as Ball Pythons have heat sensors which will tell them how warm a prey item is) and a warm prey item will also give off a stronger smell attracting the interest of your snake.

You've no doubt seen the response in the past when you feed your snake and he or she comes out of it's hide, waving around it's head, perfectly aware there's something to eat around but not being totally sure exactly where it is yet.

So try warming up the snake's food before giving it. I place the food into a clear plastic food bag and sit it in warm water for 20-30 minutes to warm it through thoroughly then give it to the snake.