Inflammatory bowel disease (IBD) is a term that describes disorders involving long-standing (chronic) inflammation of tissues in your digestive tract. Types of IBD include
Ulcerative colitis. This condition involves inflammation and sores (ulcers) along the lining of your large intestine (colon) and rectum.
Crohn's disease. This type of IBD is characterized by inflammation of the lining of your digestive tract, which often can involve the deeper layers of the digestive tract. Crohn's disease most commonly affects the small intestine. However, it can also affect the large intestine and uncommonly, the upper gastrointestinal tract.
Both ulcerative colitis and Crohn's disease usually are characterized by diarrhea, rectal bleeding, abdominal pain, fatigue and weight loss.
For some people, IBD is only a mild illness. For others, it's a debilitating condition that can lead to life-threatening complications.

Symptoms

Inflammatory bowel disease symptoms vary, depending on the severity of inflammation and where it occurs. Symptoms may range from mild to severe. You are likely to have periods of active illness followed by periods of remission.

Signs and symptoms that are common to both Crohn's disease and ulcerative colitis include:

Diarrhea

Fatigue

Abdominal pain and cramping

Blood in your stool

Reduced appetite

Unintended weight loss.