Ischemic Colitis: Reduced Blood Flow to the Colon and Its Warning Signs

April 8, 2026

Ischemic Colitis: Reduced Blood Flow to the Colon and Its Warning Signs

Verified By
KIMS-SUNSHINE
Specialist,
08 April, 2026

Person holding their abdomen with a pink colon diagram overlaid and text about ischemic colitis warning signs.

Colitis is a condition that causes inflammation in the colon- due to a variety of reasons. Ischemic colitis is one such kind- it is colon inflammation due to poor circulation of blood in the area. Low levels of oxygen in the colon can cause the immune system to overreact and switch on multiple inflammation related pathways. If poor blood flow persists, it can lead to bowel injury due to ischemia. If you suffer from conditions that affect blood vessels, heart disease or other conditions and are older than 60, you should get checked periodically by specialists at KIMS Sunshine Hospital- as we are the best gastroenterology hospital in Hyderabad.

Causes and Symptoms of Ischemic Colitis

These are some well known colon ischemia causes-

Any condition that affects your circulatory system is a possible cause- like low blood pressure which can lead to non-occlusive ischemic colitis. This is much rarer than the other type.
If you have blood clots- this is called occlusive ischemic colitis.
If there is a mass or growth that is pressing against the blood vessel and cutting supply off.
If you have had surgery and for some reason, blood flow was not restored for a while – like if you have an abdominal aortic aneurysm repair. This is a well known side effect of this procedure, and it is much more severe than just a transient ischemic episode.

These are some prominent ischemic colitis symptoms you should know of-

You may have severe abdominal pain with bloody stools.
Abdominal swelling with associated tenderness is also observed.
You may have diarrhoea.
You may have a low grade fever.
You may have nausea and not have much of an appetite.

If you have abdominal pain, swelling and bloody stools, please call a specialist today!

Diagnosis of Ischemic Colitis

The symptoms for ischemic colitis can be pretty generic, so doctors need to pay close attention to different symptoms and understand your medical history, before they can give you a positive diagnosis.

A blood test can reveal a higher than usual blood count and is non-specific.
Imaging is the best way to check for ischemia, so a CT scan may be done.
A colonoscopy can be done to check for specific signs which point to ischemia. A tissue sample of the colon may also be taken, if doctors suspect some other condition.

Treatment For Ischemic Colitis

Treatment normally depends on how severe issue loss is or how long your tissues have been without blood flow. If you have an infection or other complications, then you may need more aggressive treatment.

IV-fluids and broad spectrum antibiotics are given if you have an infection.
Oxygen therapy may be given, to help with low blood oxygen levels and supplement heart health.
Bowel rest is also prescribed- where you will not be allowed tp eat foods. Instead, a liquid diet or IV nutrition may be given.
Stomach decompression using a nasogastric tube – The tube can be used to draw food, fluid or air out of the stomach, if the colon has been paralysed due to ischemic colitis.
You will be given a stent, to restore blood flow, if stenosis (narrowing down) of blood vessels is present. or use clot busters to get rid of clots, if they are causing ischemia.
Colectomy– If there is prolonged ischemia, tissue death can occur and this can in turn harm surrounding healthy tissue. Doctors recommend surgical removal of necrosed tissue – by performing a bowel resection.

During recovery, you will be asked to allow your bowels to rest completely- that means no high fibre diets. This will give your colon time to heal, as digestion is a high energy process, demanding more blood flow and oxygen, which the gut does not have because of ischemic colitis.

Conclusion

Most cases of ischemic colitis are transient and people don’t really have prominent symptoms. The mucosal segment of one region is affected, while the rest are fine. So, fluids and antibiotics should be okay for them. For people with more complicated cases, surgery may be necessary. Not smoking and eating a heart-friendly diet can help prevent this condition to some degree. If you have any concerns, please don’t hesitate to call us at KIMS Sunshine Hospital today!

Frequently Asked Questions

What is ischemic colitis?

Ischemic colitis occurs when blood flow to part of the large intestine is reduced, leading to inflammation and injury. This reduction may result from narrowed or blocked blood vessels. It commonly affects older adults and can range from mild, temporary episodes to more severe forms causing lasting damage to the colon.

What are the symptoms of ischemic colitis?

Symptoms include sudden abdominal pain, often on the left side, along with an urgent need to pass stool. Bloody diarrhoea is a common feature. Some individuals experience nausea, mild fever, and tenderness over the abdomen. The severity of symptoms depends on the extent and duration of reduced blood flow.

Is ischemic colitis a medical emergency?

Ischemic colitis can become a medical emergency if blood flow is severely restricted or prolonged. This may lead to tissue death, perforation, or infection. Severe abdominal pain, heavy bleeding, and signs of systemic illness require immediate evaluation to prevent serious complications and ensure timely treatment.

What treatments are available for ischemic colitis?

Treatment depends on severity and underlying cause. Mild cases are managed with bowel rest, intravenous fluids, and antibiotics to prevent infection. Severe cases may require hospitalisation and surgery to remove damaged sections of the colon.

When should someone seek urgent medical care?
Urgent medical care is necessary if there is severe abdominal pain, persistent or heavy rectal bleeding, fever, or signs of dehydration. Sudden worsening of symptoms or signs of shock, such as dizziness and rapid heartbeat, require immediate evaluation to prevent complications and manage the condition effectively.