# Black stools, vomiting blood and a faint in a 54-year-old: a live emergency case

> A live emergency case for medical students: black stools for two days, vomiting blood and a faint. Spotting shock, what to ask about painkillers, the first tests and the differential.

- Gastroenterology · Intermediate · about 20 minutes · live emergency
- Web page: https://www.medikarya.in/case-studies/54-year-old-man-with-black-stools-who-vomited-blood
- Work up this patient: https://www.medikarya.in/case-studies/54-year-old-man-with-black-stools-who-vomited-blood

## How the patient presents

He has had black, tarry stools for two days and this morning vomited blood, then fainted in the bathroom. He takes tablets from the chemist for his knee pain. His wife came with him.

## Why black stools with collapse matters

Black, tarry stools mean bleeding high in the gut, and a faint means a lot of blood has been lost. Shock can look quiet in someone lying flat, so recognise it and start resuscitation before working out what started the bleeding.

## What to ask in the history

- How long the stools have been black, and how often
- Vomiting: fresh blood or coffee grounds
- The faint: what he was doing, warning signs, how quickly he came round
- Dizziness on standing, breathlessness, chest pain
- Painkillers: which ones, from where, how many, for how long
- Aspirin, blood thinners, steroids, alcohol
- Indigestion, previous ulcers
- Iron tablets or bismuth, which turn stools black without blood

## Red flags

- Fainting, or dizziness on sitting up
- Fast pulse, low blood pressure, cold clammy skin
- Chest pain or breathlessness
- Ongoing bleeding
- Older age, heart or kidney disease
- Confusion

## What to examine

- Airway, breathing, circulation
- Pulse and blood pressure; a postural drop only if it is safe to check
- Pallor, capillary refill
- Abdomen: tenderness, guarding, rigidity
- Rectal examination to confirm black stool
- Signs of liver disease

## First investigations

- Full blood count, crossmatch, clotting
- Urea and creatinine, liver function
- ECG, since a heart short of blood can be strained
- Lactate
- A pre-endoscopy risk score
- Upper GI endoscopy
- Erect chest X-ray or CT if perforation is suspected

## Differential diagnosis of black stools with collapse

Grouped, not ranked. Which one fits this patient is for you to work out in the case.

### Ulcer disease

- Gastric or duodenal ulcer
- Erosive gastritis

### Other upper GI causes

- Varices
- Oesophagitis
- Mallory-Weiss tear
- Cancer
- Vascular lesions

### Not blood

- Iron or bismuth
- Some foods

### Lower down

- A brisk bleed from the small or large bowel

## Common mistakes

- Putting the faint down to a simple faint.
- Reading a high urea as kidney failure, when digested blood in the gut also raises it.
- Missing a perforation in someone with ulcer risk factors.
- Not asking specifically about painkillers bought without a prescription.

---

A study guide for medical students, not medical advice. Follow your institution's protocols in practice.