Ulcerative Colitis Symptoms, IBD Inflammation and Bowel Cancer Signs Explained

By Anjela Jeganathan – Medical Herbalist | Herba Naturalle

The intestinal conditions that produce diarrhoea, abdominal cramping, bleeding, and bowel changes are grouped under a cluster of related but distinct diagnoses — IBS, IBD (including ulcerative colitis and Crohn’s disease), and bowel cancer. Each has different causes, symptoms, investigations, and treatments. Distinguishing between them is clinically important and often the first step in getting the right support.

For the comprehensive overview of all four conditions — IBS, IBD, UC, and bowel cancer — see our detailed post on IBS, IBD, UC and bowel cancer — understanding your intestinal symptoms.

Ulcerative Colitis (UC): Symptoms and Manifestations

Ulcerative colitis is a chronic inflammatory bowel disease characterised by inflammation and ulceration of the inner lining of the colon and rectum. Unlike Crohn’s disease, it affects only the colon, and the inflammation is continuous rather than patchy.

Core symptoms of ulcerative colitis include:

Bloody diarrhoea — blood mixed through the stool (not just on the surface) is a hallmark of UC
Urgency — a sudden, urgent need to defecate that may not be controllable
Mucus in stool — passed with or without diarrhoea
Abdominal cramping — typically lower left-sided, often relieved temporarily by bowel movement
Tenesmus — the sensation of incomplete evacuation, often with the urge to return immediately
Fatigue — driven by blood loss, nutritional depletion, and systemic inflammation
Weight loss during active flares

UC is a relapsing-remitting condition — periods of active disease (flares) alternate with periods of remission in which symptoms subside significantly.

IBD and Intestinal Inflammation

Inflammatory bowel disease (IBD) is the umbrella term covering both ulcerative colitis and Crohn’s disease. The hallmark of IBD is full-thickness inflammation of the bowel wall driven by a dysregulated immune response.

IBD is not the same as IBS. The key distinctions:

	IBS	IBD (UC / Crohn’s)
Inflammation	No structural inflammation	Confirmed bowel inflammation
Blood in stool	No	Yes (typically in UC)
Diagnosed by	Symptom criteria	Colonoscopy + biopsy
Remission	Ongoing management	Remitting-relapsing pattern
Treatment	Lifestyle, diet, antispasmodics	Immunosuppressants, biologics

Diarrhoea after eating — a common complaint — is discussed in the context of the gut anatomy in our post on understanding your digestive system.

Symptoms of Bowel Cancer in a Woman (and Men)

Colorectal cancer is the fourth most common cancer in the UK. Recognising it early significantly improves outcomes. Symptoms of bowel cancer include:

Persistent change in bowel habit — particularly to looser stools or increased frequency — lasting more than 4–6 weeks
Blood in stool — either dark and mixed through stool (suggesting right-sided tumour) or bright red (left-sided tumour or rectal cancer)
Abdominal pain, discomfort, or cramping that is new and persistent
Unexplained weight loss
Extreme fatigue disproportionate to activity — often driven by occult (hidden) blood loss causing iron-deficiency anaemia
A palpable mass in the abdomen
Feeling of incomplete evacuation that is new

In women, the overlap between gynaecological symptoms and bowel symptoms can complicate recognition. Any new, persistent change in bowel habit in women over 40 warrants prompt GP assessment.

IBS Medication and Management

IBS does not carry the inflammatory markers of IBD, but its symptoms — cramping, diarrhoea, bloating, and constipation — significantly affect quality of life. IBS management includes antispasmodics (mebeverine, hyoscine), laxatives for IBS-C, antidiarrhoeals for IBS-D, low-FODMAP dietary modification, and psychological approaches.

The bloating and abdominal discomfort common to both IBS and IBD is explored in our practical guide to bloating, trapped wind and constipation relief.

This article is for educational purposes only. Blood in your stool or a persistent change in bowel habit requires urgent GP assessment.