What is ill effect of dehydration?

Explanation

**Step-by-Step Solution:**

1. **Understanding Dehydration**: Dehydration occurs when the body loses more fluids than it takes in. This imbalance can lead to various health issues.

2. **Headaches**: One of the most common ill effects of dehydration is headaches. When the body is dehydrated, it can cause the brain to temporarily shrink from fluid loss, leading to pain.

3. **Urinary System Problems**: Dehydration can lead to issues with the urinary system. This may include concentrated urine, which can result in urinary tract infections or kidney stones due to the lack of sufficient water to flush out toxins.

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