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Diarrhoea

In This Article
Diarrhoea is defined as the passage of a lose liquid stool. Urgency, which often accompanies diarrhoea, is the sensation of the need to defecate without delay! Urgency can be caused by a large volume liquid stool (where the rectum becomes overwhelmed) or it can also be cuased by rectal irritation.
Frequency purely refers to the number of stools passed, and is not necessarily related to diarrhoea or urgency.
 

Important factors

  • Bloody diarrhoea is always pathological, and will nearly always be caused by some form of colitis.
  • Diarrhoea that occurs in the morning, but is followed by normal stools later in the day is rarely pathological.
  • Diarrhoea that develops in a hospitalized patient may be due to C. difficile infection – you should always check the stools for C. difficile.
  • Consider parasitic infection as a cause if there is a history of foreign travel.
  • Remember many acute episodes are infective in nature.
  • If you are unsure of a diagnosis remember it can have an endocrine cause – namely hyperthyroidism.
 
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Acute Causes

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Infective Diarrhoea

  1. Bacterial – there are four main bacterial causes:
    1. E. coli (most common)
    2. Salmonella – associated abdominal pain and occasionally vomiting
    3. Shigella - associated abdominal pain and occasionally vomiting
    4. Camp. Helicobacter
  2. Viral
    1. Rotovirus – this is THE most common cause of diarrhoea
    2. Norovirus – an umbrella term for a range of similar viruses
  3. Amoebic Dissentry
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Diarrhoea acquired abroad

  1. Cholera – this is highly dangerous. The cholera bacteria will secrete a toxin that draws fluid into the lumen at the rate of up to 1L an hour. You can lose up to 24L of fluid in a day! Basic treatment involves drinking salt and water. A sign of this condition is ‘rice water stool’ where the patients stools are so runny they look like an opaque white liquid.
  2. E. coli – tends to be more dangerous than the strains acquired at home
  3. Giardiasis – this is a small parasite that infects the duodenum and jejunum. Not only does it cause diarrhoea, but it also damages the mucosa in these regions, and so can also result in malabsorption.
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Drugs

  1. Antibiotics – there are 5 ways in which antibiotics can lead to diarrhoea:
    1. Clindamycin – this is a broad spectrum antibiotic (and the same affect may be seen in other broad spectrum AB’s) and it will kill almost all bacteria in the gut. The problem is that this then allows resistant C. difficile (if present) to proliferate and cause diarrhoea.
    2. Erythromycin – this increases gut motility. It is sometimes even used to treat constipation
    3. Penicillins – breakdown products of this act as an osmotic laxative
    4. Tetracyclin – this has an effect on fat absorption (i.e. it inhibits it) and thus leads to diarrhoea
    5. Neomycin – this affects bile salt absorption and thus the bile salts act as an osmotic laxative and draw fluid into the lumen.
  2. Laxatvies – remember that up to 5% of patients with diarrhoea that you cannot identify a cause for may be taking laxatives - a sort of psychological condition. Also remember that pretty much any drug can cause diarrhoea, some common examples are:
    1. Digoxin
    2. Magnesium salts
    3. PPi’s – particularly omeprazole
    4. Cimetidine
 
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Chronic Causes

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Metabolic disorders

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Small bowel disease

  • Crohn’s disease – pain and diarrhoea are prominent. Blood and mucous are less common. Often occurs in young adults with a long history. There may also be weight loss and malnourishment.
  • Coeliac disease – history of wheat and cereal intolerance. Often presents in adulthood with chronic diarrhoea and weight loss, and abdominal pains
  • Blind loop syndrome – this produces a frothy, foul smelling liquid stool due to bacterial overgrowth and fermentation. It is often associated with previous surgery, and may be a complication of Crohn’s disease.
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Large bowel disease

  • UC – causes intermittent bloody / mucousy stools, and may also present with colicky pain. Common in young adults. There may be a short history in the initial presentation.
  • Colon cancer – older patients, may be streaky stools (streaks due to blood and mucous). Often, a change in frequency is the only feature. A mass may be palpable, and faecal occult blood will be positive
  • IBS – this can present with both diarrhoea and constipation, or a mix of both. There may also be bloating and colicky pain, but there is never blood.
  • Spurious – compacted faeces in the rectum may cause an obstruction, that then only allows watery faeces to pass the blockage. It is common in the elderly, often those with mental illness, and also with constipating drugs.
  • Very rarely, polyps and diverticular disease may cause constipation.
 
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