Diarrhea after radiation often improves within a few weeks to a couple of months post-treatment as the bowel lining heals, but it can become a long-term issue (chronic radiation enteritis), lasting months or years, especially with higher radiation doses to the abdomen or pelvis, requiring dietary changes or medication. Short-term diarrhea usually starts during treatment and resolves, while persistent issues indicate longer-term damage to the bowel's ability to absorb fluids, impacting digestion and nerves.
How to manage bowel changes
Eat small, frequent meals. Drink plenty of fluids. Foods high in soluble fiber can help with the management of diarrhea: oatmeal, bananas, applesauce, mango, papaya, avocado, white rice, white pasta, potato, sweet potato and yam without the skin, or white bread. Avoid alcohol, caffeine, and spicy and fried food.
Loose, watery stools are a sign of diarrhea. Both constipation and diarrhea are common and usually clear up within a few days. Constipation or diarrhea that lasts longer than two weeks isn't normal. It's time to see a provider at that point.
Side effects of radiotherapy can be short or long term. Short term side effects such as tiredness will improve a few weeks after treatment. But long term effects can continue on for a lot longer and sometimes might be permanent. Your doctor will discuss this with you before you start treatment.
Radiotherapy side effects tend to get worse as you progress through your treatment. So you might not feel tired at the beginning of your course but might do towards the end. And for a few weeks afterwards. It's hard to say who will feel tired during treatment as some do and others don't.
People with chronic exposure to gamma rays and similar therapies (like the technicians who operate X-ray machines) may retain radiation for weeks or months. This depends heavily on whether or not they wear protective gear. Capsules and drinks may leave residue radiation for days after they're ingested.
Eat the BRAT diet, which includes bananas, (white) rice, applesauce and toast. These foods help firm up your stool.
Liquid diarrhea can come from many sources. This includes viral or bacterial infections, and food intolerances. Certain medications and chronic conditions like inflammatory bowel disease can also cause it.
Eat BRAT diet foods
Some instances of diarrhea can be expected during detox or gut healing- especially as the body works to clear out harmful substances. But chronic or prolonged diarrhea, lasting more than a few days, can lead to certain issues.
To harden stool, focus on bland, low-fiber foods like the BRAT diet (bananas, rice, applesauce, toast), white pasta, potatoes, and cheese, as these help bind stool by being easily digestible and low in residue, with options like crackers, oatmeal, and smooth peanut butter also working well.
A: No, but you may want to have two or three bowls of egg drop soup per day. The eggs it is made with are rich in albumin, a protein that is easily digested and absorbed into the bloodstream. Albumin helps maintain the balance of water in the bloodstream and body tissues.
Radiation treatment over the belly or abdomen area can cause loose stools or diarrhea. Two types of medicines can help: Loperamide (brand name Imodium®) is available without a prescription at drug and grocery stores or your doctor may also prescribe Lomotil® (available by prescription only).
For example, the following tissues and organs are listed from most radiosensitive to least radiosensitive:
The symptoms of radiation enteritis include diarrhea, nausea, vomiting and stomach cramps. Symptoms occur because of irritation of the intestines from radiation therapy for cancer. Symptoms usually go away several weeks after treatment ends. But sometimes they last longer.
Lifestyle and home remedies
Some more recent research has begun to look at diarrhea as part of the normal immune system response to pathogens. In this context, diarrhea may be part of the body's effort to rid the digestive tract of potentially harmful bacteria or other substances.
Kidney failure (renal failure) is a primary organ failure that commonly causes diarrhea due to the buildup of toxins, electrolyte imbalances, and inflammation in the intestines, while severe diarrhea itself can lead to acute kidney injury by causing dehydration and electrolyte loss, creating a vicious cycle. Other organ issues, especially those affecting the gastrointestinal tract like inflammatory bowel diseases (Crohn's, Ulcerative Colitis) or liver conditions, also cause diarrhea, but kidney failure directly impacts bowel function significantly.
Diarrhoea is passing looser, watery or more frequent poo (stools) than is normal for you. It affects most people from time to time. It can be distressing and unpleasant but is usually nothing to worry about. It normally clears up in a few days to a week.
It's important to note that if diarrhea is caused by bacteria, your body needs to get rid of the bacteria first by letting diarrhea run its course. If they're taken too soon, anti-diarrheal medication can make symptoms worse and keep you from clearing the infection.
For example, when treating the brain, you may experience hair loss on your head, but you would not be itchy on your chest due to brain radiation. Side effects generally begin 1-2 weeks into treatment and may peak 1-2 weeks after treatment is completed, then healing will begin.
Radiation therapy and chemo are often combined to treat cancer. While both treatments are effective, chemo generally produces more serious side effects than radiation therapy. How radiation therapy is used to treat cancer. American Cancer Society.
Conditions Treated with Radiation Therapy