Lower Anterior Resection Syndrome (LARS)
Lower Anterior Resection Syndrome (LARS) is a collection of bowel dysfunction symptoms that can occur after surgical removal of part or all of the rectum, most commonly following a low anterior resection for rectal cancer. It develops because the rectum—which normally acts as a reservoir for stool—is reduced in size or function, and the nerves that control bowel activity may be affected during surgery.
LARS can affect a significant number of patients who undergo rectal surgery, particularly those with tumors located low in the rectum or those who required radiation therapy before or after surgery. The closer the surgical connection (anastomosis) is to the anus, the higher the likelihood of experiencing symptoms. Not everyone develops LARS, but it is relatively common, with severity ranging from mild to debilitating.
Symptoms of LARS vary but often include increased stool frequency, urgency, difficulty delaying bowel movements, and fecal incontinence. Many patients also experience “clustering,” where multiple bowel movements occur within a short time frame, as well as a sensation of incomplete emptying. These symptoms can significantly impact quality of life, affecting sleep, work, and social activities.
Treatment for LARS is individualized and often involves a combination of approaches. Dietary modifications—such as adjusting fiber intake and avoiding trigger foods—can help regulate bowel function. Medications like antidiarrheal agents may reduce frequency and urgency. Pelvic floor therapy and biofeedback are commonly used to strengthen muscles and improve bowel control. In more severe cases, additional treatments such as transanal irrigation or nerve stimulation therapies may be considered.
Although LARS can be challenging, many patients see gradual improvement over time as the body adapts. Ongoing support from healthcare providers is key to managing symptoms and improving quality of life.
One of the best ways to gain some insight is to review the stories of other LARS patients.
We can’t recommend this Facebook page enough:
Living with Lower Anterior Resection Syndrome
This page is an active community of people who are managing LARS or helping a loved one navigate this diagnosis.
How To Use the Site
First, request to join. This is a private group, so you must be accepted before you can see posts and pose questions.
Second, don’t be shy. Ask the questions you need to ask. Virtually nothing is off limits; this group has the information that you need. There is no need to say, ‘I’m sure this is too much information…’. There is no such thing.
Third, use the search feature! Before asking questions that have likely been answered many times before, search first. You’ll find a huge number of responses to just about any question.
Not finding what you’re looking for via the search? Ask questions of the group. There are almost 8,000 members, so it’s very likely that someone in the group will have experienced what you are and can offer some insight, information, and probably encouragement or a practical testimonial.