Introduction

Tenesmus is a persistent urge to release urine or stool when the bladder or rectum is empty. While bladder tenesmus affects the urinary system and causes repeated desires to urinate with little to no output, rectal tenesmus is related to the colon and frequently leads to a persistent urge to defecate.¹ Accurate diagnosis and suitable treatment depend on an understanding of the difference between these illnesses. Proper identification avoids confusion, poor symptom management, and delays in treatment.

Rectal tenesmus

Definition

Rectal tenesmus is the feeling of incomplete bowel movements, even when the rectum is empty.² This causes a constant need to pass stool, pain, straining, and annoyance. Despite several tries, little or no stool may be expelled, which adds discomfort and distress.

Causes

Rectal tenesmus can be caused by several illnesses that impact bowel and rectum function. Crohn's disease, ulcerative colitis, and other inflammatory bowel diseases (IBD) cause the digestive tract to become chronically inflamed, which irritates the rectal lining and results in ongoing bowel urgency.³ 

Illnesses like bacterial dysentery and STDs like chlamydia or gonorrhoea can bring on rectal inflammation and tenesmus. Growths or tumours, such as rectal polyps and colorectal cancer, can prevent the passage of stool and cause false signals of bowel urgency, pain, mucus discharge, or bleeding. 

Irritable Bowel Syndrome (IBS) is a functional gastrointestinal illness that can induce discomfort and rectal spasms, giving the impression that evacuation is not complete.⁴ Furthermore, neurological conditions such as multiple sclerosis, spinal cord injuries, or autonomic neuropathy can disrupt the nerves that control bowel movements, resulting in incorrect emptying and a chronic sensation of fullness in the rectum.

Symptoms

Rectal tenesmus symptoms often involve a recurrent urge to pass faeces while producing little or no output. Rectal soreness or discomfort is common, especially during or after an effort to defecate., This discomfort may be accompanied by straining during bowel movements. People may occasionally see blood or mucus in their faeces, indicating an infection, inflammation, or other gastrointestinal problems.¹ If left untreated, these symptoms can cause a great deal of distress and could get worse over time.

Diagnosis

A complete medical history, physical examination, and assessment of lifestyle factors are the first steps in diagnosing rectal tenesmus. A colonoscopy or sigmoidoscopy may be done to look for any inflammation, growths or structural issues causing symptoms.⁵ To diagnose diseases such as infections or inflammatory bowel disease (IBD), stool tests are often done to detect infections, inflammation, or the presence of blood. Imaging methods like CT scans or MRIs can sometimes produce detailed images of the intestines. This enables medical professionals to identify tumours or other structural problems causing the tenesmus. Making the right diagnosis is essential to choosing the best course of action.

Treatment

Addressing the root cause is the main goal of treatment for rectal tenesmus. Anti-inflammatory drugs like corticosteroids or biologics treat disorders like inflammatory bowel disease (IBD), and antibiotics and antivirals are used to treat infections. A high-fibre diet, adequate water, and frequent exercise are dietary and lifestyle factors that support good bowel function. Stool softeners facilitate bowel movements for symptomatic relief, and antispasmodics and painkillers lessen discomfort and rectal spasms.⁶ Additional treatments might be required depending on the degree and underlying cause of symptoms.

Bladder tenesmus

Definition

Bladder tenesmus is the persistent feeling of needing to urinate even when the bladder is empty. This condition often leads to frequent urges to urinate with little or no output, causing discomfort and distress.⁷

Causes

Many conditions can cause bladder tenesmus. Bacterial infections cause urinary tract infections (UTIs) and can lead to frequent and intense urges to urinate. Interstitial cystitis is a chronic condition that involves inflammation of the bladder wall. Physical blockages like bladder stones and tumours can block urine flow, leading to incomplete emptying and the feeling of urinating again. Neurological conditions like multiple sclerosis (MS) and spinal cord injuries can interfere with nerves that control the bladder, resulting in urgency and incomplete emptying. An enlarged prostate in people assigned male at birth (AMAB) can block the urethra, resulting in urine retention and frequent urges to urinate.⁷

Symptoms

Many symptoms affecting the urinary system indicate bladder tenesmus. The most typical symptom is the urge to urinate frequently, even when little or no urine is produced. People often feel pain or a burning feeling in their bladder, especially when they urinate, which may be a sign of inflammation or infection. Lower abdominal or pelvic pain is common when the bladder becomes irritable or inflamed. Blood in the urine can occasionally occur, indicating tumours, bladder stones, or infections.¹ To properly diagnose and treat these symptoms, medical attention may be necessary.

Diagnosis

A thorough patient history and physical examination are used to identify symptoms of bladder tenesmus. Laboratory tests like urinalysis and urine culture are used to find abnormalities in the urine, including bacteria or blood. Cystoscopies and imaging methods like MRIs, CT scans, and ultrasounds directly examine the bladder for tumours, bladder stones, inflammation and other structural issues.⁵

Treatment

The underlying cause of bladder tenesmus determines the course of treatment. Antibiotics are recommended to treat urinary tract infections (UTIs). Nonsteroidal anti-inflammatory drugs (NSAIDs) or other pain relievers are offered for pain management. Bladder relaxants or antispasmodic drugs decrease urgency and bladder spasms associated with interstitial cystitis. Surgery may be required in cases involving tumours, bladder stones, or other issues to remove obstructions and restore normal urine function.⁸

Key differences between rectal and bladder tenesmus

Summary

In summary, while rectal and bladder tenesmus are characterised by a constant urge to expel waste, they have distinct effects on various bodily systems. Bladder tenesmus involves the urinary systemand rectal tenesmus involves the intestine. Bladder tenesmus is frequently brought on by urinary tract infections (UTIs), interstitial cystitis, or bladder obstructions like stones or tumours, rectal tenesmus can be brought on by conditions like inflammatory bowel disease (IBD), infections, or colon tumours. Additionally, symptoms can differ. Bladder tenesmus may cause burning feelings, pelvic discomfort, or blood in the urine; rectal tenesmus is frequently accompanied by pain during defecation and the presence of blood or mucus in the stool. Depending on the underlying reason, different treatment approaches are used. For infections, these may include anti-inflammatory drugs and antibiotics; for structural problems, bladder relaxants or surgery. An accurate diagnosis is necessary to determine the cause and guarantee successful therapy. To avoid more issues and receive care promptly, it is important to seek medical assistance if symptoms intensify, persist, or are accompanied by extreme pain, bleeding, or other troubling symptoms.