8 Symptoms of Ischemic Colitis

2. Diarrhea

Diarrhea often appears as an early sign of ischemic colitis. Reduced blood flow irritates the colon lining and limits water absorption. Your stools may become loose, frequent, and hard to control. Diarrhea can start suddenly and may feel urgent, which leads to multiple bathroom trips in a short period.

Blood or mucus can appear in your stool when the colon lining becomes injured and inflamed. The color may range from bright red to darker shades. Diarrhea often comes with other bowel changes. You may feel pressure in your lower belly or a need to empty your bowels even after you just went.

Diarrhea can raise your risk of dehydration. You may feel weak, dizzy, or very thirsty if fluid loss continues. These effects can develop quickly, especially if diarrhea lasts more than a short time. The pattern of diarrhea can vary. Some people have brief episodes, while others notice ongoing symptoms that come and go.

3. Fever

You may notice a fever when ischemic colitis affects your colon. A fever means your body temperature rises above normal and often signals that your body reacts to injury or reduced blood flow in the gut.

When your colon does not get enough blood, the bowel lining becomes irritated. Your immune system responds, and your temperature can rise as part of that response. Fever may appear with other bowel changes. You might feel weak, tired, or unwell at the same time. Some people notice fever after the start of belly pain or diarrhea, not before.

Fever does not affect everyone in the same way. You may have a short-lived fever, or it may last longer if the bowel irritation continues. A persistent fever can point to ongoing swelling or damage in the colon or signal infection in the injured tissue.

4. Intestinal Bleeding

Intestinal bleeding is a common sign of ischemic colitis. You may notice blood when you pass stool, which often appears bright red or dark maroon. This bleeding happens because part of your colon does not get enough blood flow. Low blood flow can injure the inner lining of the intestine, and when the lining breaks down, it can bleed.

You may see bleeding in different ways. Some people notice streaks of blood on the stool, while others see blood mixed into loose stool or in the toilet bowl. Bleeding can range from mild to more serious and often starts quickly. Small amounts may come and go, but heavier bleeding can happen if a larger area of the colon is affected. You may also notice bleeding along with other bowel changes, such as sudden diarrhea, an urgent need to use the bathroom, or cramping or pain in the lower belly.

5. Nausea and Vomiting

You may feel nausea or start vomiting when ischemic colitis affects your colon. Reduced blood flow irritates the bowel and upsets your stomach, often starting soon after belly pain or cramping. Nausea can come and go, or it may last for several hours. You might feel worse after eating because digestion needs more blood flow, and when the colon does not get enough blood, your body can respond by making you feel sick.

Vomiting does not always happen, but it can occur in moderate or severe cases. You may vomit food, fluid, or bile, which can lead to dehydration if it continues, especially if you also have diarrhea. Nausea and vomiting can make it hard to eat or drink, which leaves you feeling weak or tired. These symptoms often signal that your digestive system is under stress and not getting the blood supply it needs.

6. Abdominal Bloating

You may notice abdominal bloating as a common symptom of ischemic colitis. Your belly can feel full, tight, or stretched, and it may look swollen even if you have not eaten much. Reduced blood flow slows digestion in part of your colon, which causes food and gas to build up. The trapped gas increases pressure, and this leads to a heavy or uncomfortable feeling.

You might feel bloating along with other changes in your digestion, and these signs can vary from day to day. Common features you may notice include a sense of fullness that does not improve after a bowel movement. You may also experience pressure or mild pain across the lower belly, and increased gas or frequent passing of gas.

Bloating from ischemic colitis can worsen after meals. Your colon may struggle to handle normal digestion when blood flow drops, even for a short time. The feeling may come and go as blood flow changes, with some days feeling mild, while others feel more intense.

7. Confusion

You may notice confusion during ischemic colitis, especially when your body does not get enough blood flow. Reduced blood flow can lower oxygen delivery to your brain, which affects how clearly you think.

Confusion may show up as trouble focusing, feeling disoriented, or having trouble following simple conversations. You might feel unusually sleepy or slow to respond. Several factors linked to ischemic colitis can add to confusion, such as fluid loss from diarrhea, low blood pressure, or infection in the body. When fluids drop too low, your brain may not work as well as usual.

You may also feel confused if pain becomes intense or long lasting. Severe pain can stress your body and disrupt normal brain function. Poor sleep during illness can make this symptom stronger.

Older adults may notice confusion more clearly, as aging brains react faster to changes in blood flow and hydration. Confusion often occurs with other symptoms, such as weakness, dizziness, or fever.

8. Low Blood Pressure

Low blood pressure can appear as a symptom of ischemic colitis when your colon does not get enough blood. When pressure drops, less blood reaches the intestinal wall, which can trigger pain and other bowel changes. This condition may cause dizziness, weakness, or lightheadedness, especially when you stand up or move too fast.

Some people notice fainting or blurred vision. These signs can happen before or during bowel symptoms. Fluid loss from ongoing diarrhea, vomiting, or bleeding from the bowel can lower the amount of fluid in your body and make blood pressure fall. As fluid drops, blood flow to the colon decreases.

Certain health problems raise this risk. Heart disease, narrowed blood vessels, or sudden drops in blood volume can affect circulation. In older adults, the body may not adjust as fast to changes in pressure. You might also notice cold hands, pale skin, or fast breathing during an episode. These signs show that your body is trying to protect vital organs by shifting blood away from the gut.