While some cases of diverticulitis are caused by straining during bowel movements or dietary choices, this type of inflammatory condition can also be caused by an infection of some kind. Bacterial, fungal or viral infections can all cause or exacerbate diverticulitis, so eliminating those pathogens is the first step to relieving the symptoms. Oregano oil has potent antimicrobial and antibacterial effects, making it a valuable ally in the battle against this conditoon. Oregano oil can be mixed with water and consumed or mixed with your food for quick results.