Polydipsia , hyperglycemia and polyuria occur due to

Options

A. Undersecretion of insulin
B. Undersecretion of thyroxine
C. Undersecretion of oestrogen
D. Hypersecretion of glucagon

Answer

To solve the question regarding the symptoms of polydipsia, hyperglycemia, and polyuria, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Symptoms**:
- **Polydipsia**: This refers to excessive thirst, where an individual feels the need to drink large amounts of water.
- **Hyperglycemia**: This is characterized by elevated levels of glucose in the blood.
- **Polyuria**: This means excessive urination, where an individual produces an abnormally large volume of urine.

2. **Identifying the Condition**:
- These three symptoms are commonly associated with diabetes mellitus. In diabetes, the body either does not produce enough insulin (Type 1 Diabetes) or does not effectively use the insulin it produces (Type 2 Diabetes).

3. **Linking Symptoms to Insulin Deficiency**:
- Insulin is a hormone that helps regulate blood glucose levels. When there is insufficient insulin, glucose cannot be effectively utilized by the cells, leading to increased blood glucose levels (hyperglycemia).
- As a result of high blood glucose levels, the kidneys excrete excess glucose into the urine, leading to increased urine production (polyuria).
- The loss of fluids through increased urination can lead to dehydration, which triggers excessive thirst (polydipsia).

4. **Conclusion**:
- Therefore, the combination of polydipsia, hyperglycemia, and polyuria is indicative of diabetes mellitus due to insulin deficiency.

### Final Answer:
The correct answer is that polydipsia, hyperglycemia, and polyuria occur due to **diabetes mellitus**.

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