Untreated rectal abscesses can lead to various complications. These may include the spread of infection to nearby tissues, the formation of fistulas, abnormal passages between organs, chronic pain, recurrent abscesses, and the risk of systemic infection (sepsis). Additionally, abscesses can cause discomfort, difficulty with bowel movements, and discomfort while sitting or moving. Timely medical intervention is crucial to prevent these complications and ensure proper treatment.