**Question:** MC side effect of IUCD insertion:

A. Increased bleeding
B. Infertility
C. Pelvic pain
D. Depression

**Correct Answer:** B. Infertility

**Core Concept:** Side effects of IUCD (Intra Uterine Contraceptive Device) insertion

**Why the Correct Answer is Right:**

Intrauterine contraceptive devices (IUCDs), particularly copper-T and hormonal IUCDs, can have various side effects when inserted into a woman's uterus for contraception. One of the significant side effects is **infertility**. This occurs due to the hormonal changes triggered by the contraceptive hormone released by the IUCD.

**Why Each Wrong Option is Incorrect:**

A. Increased bleeding (Option A) is a common side effect, but infertility is not directly linked to increased bleeding.
C. Pelvic pain (Option C) is also a common side effect, but infertility is not the same thing.
D. Depression (Option D) is not a direct side effect of IUCD insertion, though it can be a possible indirect consequence of hormonal imbalance caused by the contraceptive hormone.

**Why the Correct Answer is Right:**

The correct answer, infertility (Option B), is a direct consequence of the hormonal changes induced by the contraceptive hormone released by the IUCD. This hormone interferes with the normal hormonal milieu required for successful fertilization and implantation, leading to reduced fertility in women who use IUCDs.

**Clinical Pearl:** When counselling patients about IUCD usage, emphasize these side effects to ensure they are well-informed of the potential consequences. In some cases, infertility can be reversed after the IUCD is removed, while in others, it may persist. Informed decision making is crucial, especially considering the numerous non-hormonal contraceptive options available.