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Overview

What Is Ulcerative Colitis?

Ulcerative colitis is a chronic inflammatory bowel disease that affects the inner lining of the rectum and colon. Inflammation can cause small ulcers, bleeding, diarrhea, and abdominal discomfort. Symptoms often flare for a time and then improve during periods of remission. Ulcerative colitis is not contagious and can affect people of different ages.

Symptoms

Ulcerative Colitis Symptoms

  • Frequent diarrhea
  • Blood in the stool (rectal bleeding)
  • Mucus or pus in the stool
  • Abdominal pain or cramping
  • An urgent need to have a bowel movement (fecal urgency)
  • A feeling that a bowel movement is incomplete (tenesmus)
  • Unintended weight loss
  • Fatigue
  • Fever

Ulcerative colitis symptoms vary depending on how much of the colon is affected and how active the inflammation is. Symptoms may come and go, with periods of worsening followed by remission. Some people also develop symptoms outside the digestive tract, such as joint pain or swelling, skin changes, or eye inflammation.

WHEN SYMPTOMS CHANGE

Seek medical advice for worsening symptoms

New or worsening bloody diarrhea, signs of dehydration, severe abdominal pain, or fever should be assessed promptly by a healthcare professional. Do not rely on self-diagnosis, because infections and other conditions can cause similar colitis symptoms.

Causes

What Causes Ulcerative Colitis?

Ulcerative colitis likely develops when the immune system has an inappropriate response involving normal gut microbes in a person with genetic susceptibility. This response causes persistent inflammation in the lining of the colon and can lead to ulcer formation. Researchers believe that several genetic, immune, microbiome, and environmental factors may work together rather than there being one single cause.

  • A family history of ulcerative colitis or another inflammatory bowel disease can increase risk.
  • Changes in immune activity may cause the body to attack healthy tissue in the digestive tract.
  • Differences in gut bacteria and other environmental factors may contribute to disease development.
  • Stress and certain foods may worsen symptoms for some people but do not appear to be the sole cause.

Risk Factors

Ulcerative Colitis Risk Factors

  • Having a close relative with ulcerative colitis or Crohn’s disease increases risk.
  • Ulcerative colitis can begin at any age but is often diagnosed in adolescents and young adults.
  • Living in an industrialized or urban environment is associated with a higher risk in some studies.
  • Some medicines or prior infections may influence risk, but they are not established causes for everyone.
  • Smoking status and changes in smoking can affect inflammatory bowel disease risk and disease behavior in complex ways.

Complications

Ulcerative Colitis Complications

  • Ongoing intestinal bleeding can cause iron-deficiency anemia.
  • Severe diarrhea can lead to dehydration and electrolyte problems.
  • Reduced intake or intestinal inflammation can contribute to nutritional deficiencies and weight loss.
  • Long-term inflammation may increase the risk of low bone density.
  • Inflammation can affect the joints, skin, eyes, or liver in some people.
  • A severe flare can rarely cause toxic megacolon, a dangerous widening of the colon.
  • A deeply inflamed colon can rarely develop a tear called perforation.
  • Long-standing extensive ulcerative colitis can increase colorectal cancer risk.

URGENT COMPLICATION WARNING

Severe symptoms need immediate care

Seek emergency evaluation for severe abdominal swelling, intense pain, persistent vomiting, heavy rectal bleeding, high fever, or sudden worsening. These symptoms may signal a serious complication that requires urgent treatment.

Diagnosis

How Is Ulcerative Colitis Diagnosed?

Diagnosing ulcerative colitis involves reviewing symptoms and medical history and performing appropriate tests. No single test proves that a person has ulcerative colitis, and infections, Crohn’s disease, and other conditions can cause similar bowel symptoms. Clinicians use the overall pattern of findings to make a diagnosis and plan care.

  • Blood tests can look for anemia, inflammation, infection, and nutritional problems.
  • Stool tests can check for intestinal infections and inflammation markers.
  • Colonoscopy or flexible sigmoidoscopy allows direct viewing of the colon lining.
  • Biopsies taken during endoscopy can show microscopic inflammation and help distinguish ulcerative colitis from other conditions.
  • Imaging such as CT or MRI may assess complications or areas that endoscopy cannot fully evaluate.

Treatment & Management

Ulcerative Colitis Treatment and Management

Ulcerative colitis treatment aims to calm active inflammation, maintain remission, relieve symptoms, support nutrition, and reduce complications. The plan depends on the extent and severity of disease, previous treatment response, other health needs, and the person’s preferences. Treatment may be adjusted over time as symptoms and test results change.

ApproachWhat it may includeMain purpose
Anti-inflammatory medicinesAminosalicylates and corticosteroidsControl mild-to-moderate inflammation or short-term flares
Immune-targeting medicinesImmunomodulators, biologics, and targeted small-molecule medicinesTreat moderate-to-severe disease or maintain remission
Supportive careHydration, individualized nutrition support, anemia treatment, and symptom monitoringProtect overall health and address effects of inflammation
SurgeryRemoval of the colon and rectum when disease is uncontrolled or complications occurProvide definitive treatment for the diseased colon in selected cases

TREATMENT SAFETY

Follow an individualized care plan

Do not stop or change ulcerative colitis medication without speaking with your clinician, even if symptoms improve. Diet plans should also be individualized; there is no universal list of foods that every person with ulcerative colitis must avoid.

Outlook and Prognosis

Outlook and Prognosis for Ulcerative Colitis

Ulcerative colitis is usually a chronic condition with periods of active symptoms and remission. Although it does not currently have a simple cure with medication, treatment can help many people control inflammation and maintain their usual activities. Ongoing follow-up is important because the condition and treatment needs can change over time.

  • The amount of colon affected and the severity of inflammation influence the disease course.
  • Regular treatment and follow-up can reduce the risk of uncontrolled flares and complications.
  • Some people need medication adjustments when symptoms return or treatment stops working.
  • Colorectal cancer surveillance becomes important for many people with long-standing or extensive disease.
  • Surgery can be a treatment option when medications do not control disease or serious complications develop.

When Should You See a Doctor

When Should You See a Doctor for Ulcerative Colitis?

  • Make a medical appointment for persistent diarrhea, rectal bleeding, abdominal pain, or unexplained weight loss.
  • Contact your clinician promptly if diagnosed symptoms become more frequent, severe, or difficult to control.
  • Ask for medical advice about medication side effects, missed doses, or treatment that no longer seems effective.
  • Seek emergency care for severe abdominal pain or swelling, heavy bleeding, fainting, high fever, persistent vomiting, or signs of dehydration.

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