Give the cause and one symptom of the following diseases or disorders of the system :
Anaemia

Explanation

**Step-by-Step Solution for the Question:**

1. **Understanding Anemia**:
- Anemia is a condition characterized by a decrease in the number of red blood cells (RBCs) or the amount of hemoglobin in the blood. This leads to a reduced capacity of the blood to carry oxygen to the body's tissues.

2. **Identifying the Causes of Anemia**:
- **Blood Loss**: This can occur due to various reasons such as heavy menstrual periods, gastrointestinal bleeding, or injuries.
- **Iron Deficiency**: A lack of iron in the diet can lead to insufficient hemoglobin production, which is essential for red blood cell formation.
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