Cholera Symptoms: Early Signs & Warning Signs

Quick Glance: Common Cholera Symptoms

The following are some of the common symptoms of cholera:

Sudden watery diarrhoea
Large amounts of watery stools
Vomiting
Excessive thirst
Dry mouth and tongue
Muscle cramps
Weakness or fatigue
Reduced urine output

Cholera Symptoms That Should Not Be Ignored

The table below highlights cholera symptoms that may indicate significant fluid and electrolyte loss and require prompt medical evaluation:

Symptom	What It May Indicate
Profuse watery diarrhoea	Rapid loss of water and electrolytes, increasing the risk of severe dehydration
Repeated vomiting	Further loss of fluids and electrolytes, making dehydration more difficult to prevent
Excessive thirst	A sign that the body is losing more fluid than it is replacing
Very little or no urine	Significant dehydration and reduced blood flow to the kidneys
Very dry mouth and tongue	Substantial fluid loss and dehydration
Sunken eyes	A sign of significant dehydration
Dizziness or light-headedness	Reduced circulating blood volume associated with dehydration
Severe weakness or lethargy	May occur with severe dehydration and electrolyte disturbances

Why Do Cholera Symptoms Occur?

Cholera develops after infection with Vibrio cholerae, usually contracted through contaminated food or water. The bacteria produce cholera toxin, which affects cells lining the small intestine and causes large amounts of water and electrolytes to move into the bowel.

This rapid loss of fluid leads to the characteristic watery diarrhoea associated with cholera. Losing water and electrolytes can then lead to thirst, weakness, muscle cramps, dizziness and reduced urine output.

Cholera can affect the following:

Small intestine: Cholera toxin causes increased secretion of water and electrolytes into the intestine.
Sodium and chloride: Loss of these electrolytes contributes to dehydration and electrolyte imbalance.
Potassium: Loss of potassium can contribute to muscle weakness and cramps.
Blood circulation: Severe fluid loss can reduce circulating blood volume, leading to low blood pressure.
Kidneys: Reduced blood flow to the kidneys can decrease urine production.

Cholera Symptoms That Require Immediate Medical Attention

Seek immediate medical care if cholera symptoms are severe or if there are signs that dehydration is becoming serious. This is particularly important when diarrhoea or vomiting makes it difficult to replace the lost fluid. These alarming symptoms may include:

Profuse watery diarrhoea
Repeated vomiting that makes drinking difficult
Very little or no urine
Sunken eyes
Very dry mouth and tongue
Severe weakness or lethargy
Dizziness or fainting
Confusion or reduced consciousness
Difficulty drinking or keeping fluids down

Severe dehydration caused by cholera can become life-threatening without rapid medical care and fluid replacement.

Symptoms of Cholera in Children

Children can develop the same cholera symptoms as adults, including watery diarrhoea, vomiting, thirst and weakness. However, young children can become severely dehydrated when they lose large amounts of fluid through diarrhoea and vomiting.

Common symptoms of cholera in children include:

Frequent watery diarrhoea
Vomiting
Excessive thirst
Dry mouth
Reduced urine output
Sunken eyes
Weakness or unusual sleepiness
Irritability or restlessness
Muscle cramps
Difficulty drinking or signs of severe dehydration

Infants, young children, older people and people who are already unwell are at greater risk of becoming severely ill with cholera.

Can You Have Cholera Without Symptoms?

Yes, cholera can occur without noticeable symptoms. Most people infected with Vibrio cholerae do not develop any symptoms, while some may experience only mild diarrhoea.

Even when cholera symptoms are absent or mild, an infected person can shed the bacteria in their faeces and contribute to the spread of infection. When symptoms do develop, they can range from mild diarrhoea to severe watery diarrhoea with rapid dehydration.

When Can Cholera Symptoms Become Life-Threatening?

The table below explains the main complications that can make cholera symptoms life-threatening and why they require urgent medical attention:

Condition	Why It Is Serious
Severe dehydration	Rapid loss of water and electrolytes can cause dangerously low blood volume.
Hypovolaemic shock	Severe fluid loss can reduce blood flow to vital organs and cause organ dysfunction.
Severe electrolyte imbalance	Major losses of electrolytes can affect muscle and nerve function and may interfere with normal heart function.
Acute kidney injury	Severe dehydration can reduce blood flow to the kidneys and impair kidney function.
Reduced consciousness	Severe dehydration and shock can affect brain function and may lead to loss of consciousness.

How are Cholera Symptoms Diagnosed?

A healthcare professional assesses the symptoms, checks for signs and severity of dehydration, and considers possible exposure to contaminated food or water. Laboratory testing can then help confirm a cholera infection.

The table below outlines the main tests and assessments that may be used when evaluating suspected cholera:

Diagnostic Test or Assessment	Purpose
Stool culture	Detects and confirms Vibrio cholerae in a stool sample.
Polymerase chain reaction (PCR)	Detects genetic material from Vibrio cholerae and can confirm infection.
Rapid diagnostic test (RDT)	Provides a rapid indication of possible cholera infection but does not replace confirmatory testing.
Blood electrolyte tests	Assess electrolyte disturbances resulting from significant fluid loss.
Kidney function tests	Check kidney function when severe dehydration is present.
Clinical assessment	Evaluates symptoms and determines the severity of dehydration.

FAQs

Q1. What is the first symptom of cholera?

Ans: The first symptom of cholera is often sudden, watery diarrhoea. Vomiting, thirst and signs of dehydration may develop as fluid loss increases.
Q2. Can cholera cause vomiting?

Ans: Yes, cholera can cause vomiting. Repeated vomiting can increase the loss of water and electrolytes and make dehydration more difficult to prevent.
Q3. Does cholera always cause severe diarrhoea?

Ans: No, cholera does not always cause severe diarrhoea. Most people infected with Vibrio cholerae do not develop symptoms, while some have mild diarrhoea.
Q4. Can cholera cause dehydration?

Ans: Yes, cholera can cause rapid dehydration because large amounts of water and electrolytes are lost through watery diarrhoea and, in some cases, vomiting.
Q5. Can children develop cholera?

Ans: Yes, children can develop cholera. Young children can become severely dehydrated when diarrhoea and vomiting cause substantial fluid loss. Therefore, signs such as reduced urine output, sunken eyes, weakness and difficulty drinking should be taken seriously.
Q6. Can cholera occur without symptoms?

Ans: Yes, cholera can occur without noticeable symptoms.
Q7. Which cholera symptoms require immediate medical attention?

Ans: Cholera symptoms such as profuse watery diarrhoea, repeated vomiting, very little or no urine, severe weakness, dizziness, confusion or reduced consciousness require immediate medical attention.
Q8. When should I see a doctor for cholera symptoms?

Ans: You should seek medical care promptly if you develop cholera symptoms like sudden watery diarrhoea, particularly when it is frequent or accompanied by vomiting, excessive thirst, reduced urine output or other signs of dehydration.