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A hangover is something most people have experienced at least once—headache, nausea, fatigue, and that overall “not feeling right” sensation after a night of drinking. But what exactly causes a hangover? It’s not just one factor—it’s a combination of several effects alcohol has on your body.

1. Dehydration Is a Major Cause

Alcohol acts as a diuretic, meaning it increases urine production. This causes your body to lose more fluids than usual, leading to dehydration.

Effects:

• Thirst
• Dizziness
• Headache

2. Toxic Byproducts (Acetaldehyde)

When your body processes alcohol, it breaks it down into a toxic compound called acetaldehyde. This substance is more harmful than alcohol itself and contributes to many hangover symptoms.

Effects:

• Nausea
• Sweating
• Rapid heartbeat

3. Inflammation in the Body

Alcohol triggers an inflammatory response in your immune system. This can make you feel tired, weak, and mentally foggy.

Effects:

• Fatigue
• Poor concentration
• Mood changes

4. Low Blood Sugar Levels

Drinking alcohol can reduce your blood sugar levels, especially if you haven’t eaten enough.

Effects:

• Weakness
• Shakiness
• Irritability

5. Sleep Disruption

Even though alcohol may make you feel sleepy, it actually disrupts your sleep cycle. You may wake up feeling tired even after several hours of sleep.

Effects:

• Lack of energy
• Poor focus
• Grogginess

6. Congeners (Impurities in Alcohol)

Dark alcoholic drinks like whiskey and red wine contain congeners, which can worsen hangover symptoms compared to lighter drinks.

Conclusion:

A hangover isn’t caused by just one thing—it’s the result of dehydration, toxins, inflammation, low blood sugar, and poor sleep working together.

The best way to avoid a hangover is to drink responsibly, stay hydrated, and ensure you eat properly before and after drinking.