OK, I presume there is no visual abnormalities such as constipation. It wouldn't hurt to wash your snake in warm water with a mild antiseptic or better, a special solution from the pet shop to combat external parasites.
Also have a look through side the mouth to make sure the gums are a healthy looking pink colour. and if you can get the mouth open, look at the denture and make sure that there is nothing caught that has gone bad. There may also be a sore that is putting Lloyd of his food.
The external parasites option is the most obvious in which case you need to rid the snake of them and most important, thoroughly clean the housing.