What could cause unusually loud abdominal sounds for almost a month now?

Likely not serious: It's more likely from too much gas in your intestines from gas produced by the food/drink that you ingest e.g.Gas-producing veggies/ fruits, caffeine or soda etc. If you have other complaints like abdominal pain, nausea, vomiting, diarrhea, constipation, fatigue, bloody stool etc, go see your dr for an accurate dx. Take care!