What Happens When You Don't Drink Enough Water? 10 Hidden Effects on Your Body

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  1. What happens to your blood when you become dehydrated? Blood contains: Red blood cells. White blood cells. Platelets. Plasma, which is mostly water. Proteins, electrolytes, nutrients and other substances. When the body loses too much water, plasma volume can decrease. This can cause hemoconcentration, meaning some substances in the blood appear more concentrated. Possible effects include: Increased blood viscosity under some circumstances. Reduced circulating blood volume. Increased strain on the cardiovascular system. Reduced blood flow to organs in severe dehydration. This is different from having excessive cholesterol or fatty deposits in arteries. NCBI+2 2. Does dehydration increase cholesterol readings? This is where our article can become particularly interesting. A small human study involving 15 healthy participants found that fasting without fluid replacement produced higher measured total cholesterol, LDL cholesterol and HDL cholesterol than fasting with water and sal...
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Heart Attack, Cardiac Arrest, and Stroke: What Is the Difference?

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Heart attack, cardiac arrest, and stroke are three serious medical emergencies, but they are not the same. A heart attack occurs when blood flow to part of the heart muscle is blocked. Cardiac arrest happens when the heart suddenly stops pumping blood effectively. A stroke occurs when blood flow to part of the brain is blocked or a blood vessel in the brain bursts.

Although these conditions can have different causes and symptoms, all require urgent medical attention.

Understanding the differences can help you recognise warning signs and respond quickly when every second matters.

1. What Is a Heart Attack?

A heart attack occurs when blood flow to the heart muscle is severely reduced or blocked, often because of a blood clot forming in a coronary artery.

Common warning signs include:

  • Chest pain, pressure, tightness, or discomfort.

  • Pain spreading to the arms, back, neck, jaw, or stomach.

  • Shortness of breath.

  • Cold sweats, nausea, or dizziness.

  • Unusual tiredness, sometimes without obvious chest pain.

Symptoms can vary, particularly among older adults and people with diabetes.

What to do: Call 999 in Malaysia immediately if you suspect a heart attack. Do not drive yourself to the hospital.

2. What Is Cardiac Arrest?

Cardiac arrest happens when the heart suddenly stops pumping blood effectively, causing blood flow to the brain and other vital organs to stop.

It is often caused by an electrical problem in the heart. A heart attack can trigger cardiac arrest, but the two conditions are different.

Warning signs include:

  • Sudden collapse.

  • Loss of consciousness.

  • No normal breathing or only gasping.

  • No response when called or gently tapped.

What to do: Call 999, begin CPR immediately, and use an automated external defibrillator (AED) if available. Follow the emergency operator's instructions.

Cardiac arrest is immediately life-threatening. Quick CPR and defibrillation can save a life.

3. What Is a Stroke?

A stroke occurs when part of the brain loses its blood supply or a blood vessel in the brain ruptures. Brain cells can begin to die within minutes.

Remember FAST:

  • F — Face: One side of the face droops.

  • A — Arms: One arm becomes weak or drifts downward.

  • S — Speech: Speech becomes slurred or difficult to understand.

  • T — Time: Call 999 immediately.

Other symptoms may include sudden vision problems, severe dizziness, difficulty walking, or a sudden severe headache.

What to do: Seek emergency help immediately, even if the symptoms disappear. Note when the symptoms began. Do not give food, drink, or medication unless instructed by medical professionals.

4. The Main Differences at a Glance

ConditionWhat goes wrong?Main warning signs
Heart attackBlood flow to the heart muscle is blockedChest discomfort, breathlessness, sweating
Cardiac arrestThe heart suddenly stops pumping effectivelyCollapse, unconsciousness, abnormal or absent normal breathing
StrokeBlood flow to the brain is blocked, or a brain blood vessel rupturesFacial drooping, arm weakness, speech difficulty

5. Can These Conditions Be Prevented?

Not every emergency can be prevented, but healthy daily habits can reduce the risk of heart attack and many strokes. They may also improve overall cardiovascular health.

Consider these practical steps:

  • Control blood pressure: High blood pressure damages blood vessels and increases the risk of heart disease and stroke.

  • Manage blood sugar: Persistently high blood sugar can damage blood vessels and increase cardiovascular risk.

  • Eat a balanced diet: Choose more vegetables, whole fruits, whole grains, beans, and other nutritious foods. Limit excess salt, added sugar, and unhealthy fats.

  • Stay physically active: Regular activity supports heart health and helps manage blood pressure, weight, and blood sugar.

  • Avoid smoking: Smoking damages blood vessels and increases cardiovascular risk.

  • Attend regular health check-ups: Monitor blood pressure, cholesterol, and blood glucose, especially as you get older.

A heart attack affects blood flow to the heart muscle, cardiac arrest causes the heart to stop pumping effectively, and a stroke damages the brain through interrupted blood flow or bleeding.

Knowing the difference matters, but recognising an emergency and acting quickly matters even more.

If you suspect a heart attack, cardiac arrest, or stroke, call 999 in Malaysia immediately. Do not wait for symptoms to become worse.

Your health is precious. Share this article with your family and friends so they can recognise the warning signs and know when to seek emergency help.

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