IBD Complications, Related Conditions And Safety

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IBD doesn't always affect only the gut; in some people, ongoing inflammation can lead to complications or affect other parts of the body. Complications in IBD can occur for different reasons. Long-term complications can increase the risk of morbidity and mortality. Understanding these complications can help clinicians diagnose and manage them during medical emergencies.

Why Complications Occur

Complications in IBD can occur for different reasons. Ongoing inflammation may damage the bowel or affect other parts of the body. In some people, repeated inflammation can lead to problems like narrowing of the intestine and fistulas. Long-lasting, unmanaged immune system attacks can lead to complications such as tissue damage, scarring, and structural changes in the digestive tract. 

Poor appetite, reduced food intake, and difficulty absorbing nutrients can contribute to deficiencies and weight loss. Some complications are also related to medicines or infections. The risk is not the same for everyone and can depend on the type of IBD, how active the disease is, and how well it is controlled.

Severe complications or emergencies can also develop in patients during inflammatory bowel disease (IBD), including colitis, abdominal abscesses, malignancy, primary sclerosing cholangitis, and pouchitis. Complications caused by Crohn’s disease and ulcerative colitis can increase morbidity and mortality rates. Understanding these complications is important for further diagnosis and the treatment process. 

Bleeding And Anaemia

Bleeding from the bowel can occur during an active IBD flare, especially with ulcerative colitis. If bleeding is frequent or continues for a long time, the body may lose more iron and red blood cells than it can replace, leading to Anemia. 

Anemia can cause fatigue, weakness, dizziness, shortness of breath, and a faster heartbeat. But not all anemia in IBD is caused by blood loss; it can also be caused by inflammation, iron, and multinutritional deficiencies. Treatment aims to reduce inflammation to reduce bleeding. To reduce the nutritional deficiencies, oral iron and vitamin supplements are also suggested by doctors . Severe symptoms during anemia, such as heavy bleeding, should be addressed by a professional.

Strictures, Blockage, Fistulas And Abscesses

These complications are more commonly associated with Crohn’s disease, although the risk varies from person to person. Long-term inflammation can cause strictures, where part of the intestine becomes narrowed because of swelling or scar tissue. A severe narrowing may lead to a blockage, causing cramping, bloating, vomiting, or difficulty in bowel movements.

Inflammation can also create fistulas, an abnormal passage between the intestine and another organ or the skin. A fistula can cause drainage, recurring infection, or pain around the affected area. An abscess is a collection of pus caused by infection and may cause pain, swelling, and fever. These problems need medical assessment and should not be treated at home. 

Severe Colitis And Toxic Megacolon

Severe colitis means that inflammation in the colon has become intense and may cause frequent diarrhoea, significant bleeding, fever, weakness, and abdominal pain. In rare cases, severe inflammation can lead to toxic megacolon; it is a serious condition where the colon becomes greatly swollen and stops working normally. It may cause severe abdominal swelling, pain, fever, increased heartbeat, and marked illness. Toxic megacolon is a medical emergency and requires immediate treatment.

Joint, Skin, Eye, And Liver Problems

IBD can sometimes affect parts of the body outside the digestive system. These problems are called extraintestinal manifestations and may appear during a flare or, in some cases, even when bowel symptoms are quiet. These complications include: 

• Joint: Joint pain, stiffness, or swelling can occur, particularly in the knees, ankles, or other larger joints.
• Skin: Some people may develop tender, red bumps, painful skin ulcers, or other inflammatory skin changes. 
• Eyes: Eye inflammation can cause redness, pain, light sensitivity, or blurred vision and should be checked regularly. 
• Liver and Bile Duct: IBD can be associated with liver and biliary complications, which may sometimes be found through blood tests or imaging even before symptoms appear. 

Not every joint, skin, eye, or liver problem is associated with IBD. New or frequent symptoms may be serious and need strict medical care.

Blood Clots And Dehydration

People with IBD may have a higher risk of blood clots, particularly when the disease is actively inflamed, or the person is less mobile. Hospitalization, immobility, surgery, and certain medications can also trigger the risk. A clot can develop in the leg or travel to the lungs. Pain or swelling in one leg, sudden chest pain, or difficulty breathing should be treated as warning signs and require urgent medical help. 

Dehydration is another concern, particularly during diarrhoea and vomiting. Losing too much fluid can cause thirst, dry mouth, dizziness, weakness, dark urine, or less frequent urination. Severe dehydration causes electrolyte imbalance, acute kidney stones or kidney failure, and thickened blood. Drinking enough fluids and replacing lost electrolytes can help, but severe dehydration may need strict medical attention. 

Colon Cancer Surveillance

People with long-standing IBD, especially when the colon is affected, may have a higher risk of colorectal cancer. Regular monitoring may be suggested to find early changes in the bowel lining. It is commonly done with colonoscopies. The timing of the surveillance depends on factors such as how long the person has had IBD, how much colon is affected, and other individual risk factors. Following the gastroenterologist's recommended screening can help diagnose changes early. 

Urgent Warning Signs And Where To Seek Care

Most IBD symptoms can be managed with planned follow-up, but some symptoms need urgent medical help. Heavy rectal bleeding, severe abdominal pain, repeated vomiting, difficulty in bowel movements, severe dehydration, or breathing problems need serious medical attention. Sudden chest pain, difficulty breathing, or painful swelling in one leg may also indicate a blood clot and need immediate care. 

For these warning signs, go to the nearest hospital or emergency department rather than waiting for a routine appointment. For new or worsening symptoms that are not immediately severe, contact your doctor or a gastroenterologist.

Perianal Symptoms

Perianal problems are more commonly seen in Crohn’s disease and can include pain, swelling, irritation, drainage, or a small opening near the anus. A perianal fistula or abscess may cause persistent pain, pus-like discharge, or fever. Bleeding, itching, or discomfort can also occur for other reasons, so these symptoms should not automatically be assumed to be caused by IBD. It can be diagnosed by MRI and managed with anti-TNF medicines and surgery in severe cases.

Common Perianal Symptoms are:

• Perianal abscesses or painful pus-filled pockets of infection near the anus.
• Perianal fistulas, causing chronic drainage, pus, and irritation 
• Anal fissures or small tears in the lining of the anus that cause sharp pain.
• Skin tags or fleshy growths of skin around the anal area due to chronic inflammation.
• Anal strictures or narrowing of the anal canal caused by scarring from chronic inflammation.
• Ulcers or deep and painful open sores in the perianal tissue. 

Medication Complications

IBD medicines can sometimes cause side effects or increase the risk of infections. Some treatments may also affect the liver, kidneys, or blood counts, so regular monitoring may be needed. Report unusual symptoms to your doctor and do not stop prescribed medicines suddenly, especially steroids.

Pregnancy Planning

Planning for pregnancy can help keep both mother and baby safe. Ideally, discuss pregnancy with your gastroenterologist beforehand so that the doctor may help control the disease and medicines can be reviewed for pregnancy safety. Do not stop IBD treatment on your own, as uncontrolled inflammation can also create risks during pregnancy.

• Aim for stable disease before conception.
• Review all medicines, supplements, and herbal products with your doctor.
• Check for and correct nutritional deficiencies. 
• Continue regular IBD and pregnancy care.
• Discuss any flare, bleeding, weight loss, or poor food intake regularly. 

Children: Growth Delay

IBD can sometimes affect a child's growth, especially when inflammation is ongoing. Poor appetite, difficulty eating, nutritional deficiencies, and increased nutritional needs can also contribute to slow growth or delayed height growth. Regular monitoring of height, weight, and growth patterns is important if growth is falling behind; the child’s gastroenterologist and dietitian can help identify appropriate nutrition and treatment. 

Emergency Symptoms Must Be Prominent

Some IBD symptoms need immediate medical attention; do not wait for a routine appointment if any of these occur

• Heavy or continuous rectal bleeding
• Severe or worsening abdominal pain
• Severe abdominal swelling with vomiting
• High fever with weakness or feeling unwell
• Fainting, confusion, or severe dehydration
• Sudden chest pain or difficulty breathing
• Painful swelling or sudden pain in one leg

If any of these symptoms occur, seek emergency care at the nearest hospital or emergency department. If you are unsure how serious the symptoms are, contact your doctor and ask for help. 

Reference 

Anemia and inflammatory bowel diseases - PMC

Crohn’s disease complicated by strictures: a systematic review - PMC

Perforated Toxic Megacolon: The Dreaded Complication in Ulcerative Colitis - PMC