What is Dehydration?

Key Takeaways on Dehydration & First Aid

• 80% of Australians experience dehydration symptoms, with lethargy, low energy, and poor concentration being most common.

• Early signs of dehydration include thirst, dry mouth, headaches, dark urine, and dizziness.

• Severe dehydration can cause sunken eyes, no urine output, low blood pressure, fever, and confusion — requiring urgent medical care.

• Infants, older adults, athletes, outdoor workers, and high-altitude residents are at higher risk.

• Common causes include inadequate water intake, vomiting, diarrhoea, excessive alcohol, high fever, and strenuous exercise in heat.

• Prevention tips: drink water regularly, carry a water bottle, stay cool in hot weather, and take extra care during outdoor activities.

• Mild dehydration treatment: rest in a cool place, sip water slowly, and avoid sugary, caffeinated, or alcoholic drinks.

• Oral rehydration solutions — store-bought or homemade (6 tsp sugar, ½ tsp salt, ½ tsp bicarbonate per 1L water) — help restore fluids.

• Australian guidelines recommend adults consume 2.5–3L of water daily to maintain healthy hydration.

• CPR First Aid training (e.g., HLTAID011, HLTAID009, HLTAID012) equips you with skills to respond to dehydration emergencies and other first aid needs.

Dehydration occurs when the body does not have enough water to operate correctly. It happens when you lose more fluid or water than you take in. Dehydration can cause numerous health issues, some of which are very significant. We’ll discuss the signs and symptoms of dehydration in great detail and offer advice on preventing it. 

What is the Dehydration Percentage in Australia?

According to Couriermail, 80% of Australians suffer from symptoms typical of dehydration, and the majority don’t recognise critical symptoms. The most common symptoms affecting Australians are lethargy (62%) or loss of energy (51%). The research also showed that less than one in 10 Australians (6%) associate problems with concentration and mental impairment with dehydration, despite it being a common symptom for most (56%).

What Causes Dehydration?

You might get dehydrated if you:

• Are you not drinking enough water
• Experiencing severe vomiting or diarrhoea
• Having a high fever
• Consuming excessive amounts of alcohol
• Engaging in strenuous exercise, particularly in hot weather
• Taking specific medications, such as diuretics
• Living with diabetes

What are the Early Signs of Dehydration?

What happens if you are dehydrated? Early signs of dehydration, or considered mild dehydration, could give you the following signs and symptoms:

1. Feeling thirsty
2. Dry mouth
3. Headache
4. Dark yellow urine
5. Dizziness or lightheadedness
6. Reduced level of urine output

What is Severe Dehydration?

Severe dehydration has signs and symptoms of extreme versions of the early symptoms. Severe dehydration includes:

1. Extremely thirsty
2. Parched mouth
3. No sweat
4. Sunken eyeball or cheeks
5. Little to no urine
6. Low blood pressure
7. Increased heart rate
8. Fever
9. Delirium
10. Fainting

What are the Signs and Symptoms of Dehydration in Children and Infants?

1. A sunken soft spot on the top of the head (sunken fontanel)
2. Irritable
3. Dry tongue and mouth
4. No production of tears when crying
5. No wet diapers for 3 hours or more

People at Risk of Dehydration

Not only people exposed to the sun are at risk for dehydration. In fact, among the athletes who frequently experience the disease are bodybuilders and swimmers. As strange as it may seem, you can sweat while swimming. Swimming causes swimmers to sweat a lot.

Dehydration is more likely to affect some persons than others, including:

1. People working outdoors who are exposed to excessive amounts of heat – welders, landscapers, construction workers, and mechanics
2. older adults – they are prone because they already have lower fluid content in the body, underlying medical conditions, or even decreased thirst 
3. people with chronic conditions – chronic conditions such as diabetes are prone to dehydration because of diabetic thirst and excessive urination
4. athletes – especially runners, cyclists, and soccer players
5. swimmers – swimmers sweat a lot underwater
6. Infants and young children are more likely to get sick from dehydration because they need more fluids daily (because they have a higher metabolic rate), lose more water through evaporation (because they have a larger surface area to volume ratio), and can’t tell you they’re thirsty or want to drink. Children and older adults should get treatment immediately, even if they only have mild symptoms of dehydration.
7. People who reside in high altitudes – due to increased urine output, dryer air, and more rapid breathing because of lack of oxygen, resulting in a more significant loss of bodily fluids.

Seek immediate medical attention if anyone of any age group exhibits any of the following symptoms:

1. Severe diarrhoea
2. Blood in the stool
3. Diarrhoea for three or more days
4. Inability to keep fluids down
5. Disorientation

How to Prevent Dehydration?

You can follow these simple steps to help you prevent dehydration:

1. Drink plain water often. 
2. Always carry water with you when you leave the house. 
3. Seek cool or shady places when you are out of the house.
4. Be mindful of dehydration when doing outdoor activities.
5. Take extra hydration and care during extreme exposure to heat.

How is Dehydration Treated?

Severe dehydration requires urgent medical attention. In a hospital, treatment often involves receiving fluids through an intravenous (IV) drip.

Managing Mild Dehydration at Home
If you have mild dehydration symptoms, follow these steps:

• Move to a calm environment.
• Loosen tight clothing and remove extra layers.
• Sip small amounts of cool water frequently.

Avoid certain fluids that can worsen dehydration, such as:

• Sugary drinks, including soda and sports drinks.
• Caffeinated beverages.
• Alcohol.

Rehydration Solutions
Oral rehydration solutions, available at pharmacies and supermarkets, can help treat dehydration. Consult your doctor or pharmacist to determine the best option for you or your child.

You can also prepare a homemade rehydration solution by mixing the following in 1 litre of water:

• 6 teaspoons of sugar.
• 1/2 teaspoon of salt.
• 1/2 teaspoon of sodium bicarbonate.

Before giving a homemade rehydration solution to your child, or if you:

• Have diabetes.
• Are pregnant.
• Are breastfeeding.
  Always seek advice from your doctor first.

How Much Water Should You Drink?

The Australian Government National Health and Medical Research Council recommends adult water consumption. The body must retain a minimal amount to maintain a tolerable solute load for the kidneys. Excluding perspiration, the average water turnover in adults is approximately 4% of total body weight. For a 70 kg adult, this is equivalent to 2,500-3,000 mL/day.

What First Aid Courses Can You Study In CPR First Aid Australia?

If you need a general First Aid qualification, we recommend the HLTAID011 Provide first aid. This also includes a CPR qualification. The Australian Resuscitation Council (ARC) suggests updating this qualification every three years.

– If you want to update your CPR qualification, we recommend HLTAID009 Provide cardiopulmonary resuscitation. The Australian Resuscitation Council (ARC) recommends updating this qualification annually.

Suppose you need first aid qualifications to work in the childcare industry and require Anaphylaxis and Asthma training ONLY. In that case, you should consider HLTAID012, which provides an emergency first aid response in an education and care setting.

If you work with children, you may also be required to obtain first aid training in Asthma and Anaphylaxis. Before enrolling, you must check with the employer to ensure the client receives the proper training for their circumstances.

Please note that you must confirm with your employer what qualifications to take before booking.

In Australia, workplaces must follow occupational health and safety regulations. These regulations specify, among other things, that businesses and care organisations must have personnel with current, recognised workplace-approved first aid and CPR training. Other courses include childcare first aid and advance first aid.

Click here to view a complete list of CPR First Aid courses currently available on RTO’s scope of registration.

Click here to find CPR and first aid Courses near you.

ABOUT CPR FIRST AID

RTO No. 21903: CPR First Aid was founded in 2007. We specialise in providing first aid training in CPR, asthma, and anaphylaxis for various workplaces, including childcare, schools, and other industries in NSW, VIC, SA, WA, and QLD. We are a Registered Training Organisation with the Australian Skills Quality Authority (No 21903). Our courses and Units are VET-accredited for workplaces in Australia

Conclusion

Dehydration could lead to life-threatening complications. Knowing how to differentiate the signs and symptoms of dehydration at early and severe stages could make you perform the correct management. Make sure to drink enough water. Water is undoubtedly beneficial; we need to have proper hydration habits.