I'll look it up in my books but I believe the main reason is over eating anything other than hay. Greedily eating too much grain, fancy weeds, wet leaves....anything like that will cause bloat. If not treated quickly most will die. Start treatment by walking the goat and massaging the bloated side. There is also stuff from your vet you can feed to the goat to help relieve the bloating. Also keep regular ole' Arm and Hammer baking soda available all the time in a dish...especially during hot weather. The goats will lick it as needed.
Caretaker of 2 dobermans,, 1 schnauzer, 5 cats, 3 goats, 1 parrot, 1 bearded dragon lizard, 11 chinchillas.
Rest in peace, Cricket, Casey, Bella, Yank, Chloe and Bones.