Denial is a psychological defense mechanism where a person refuses to accept reality or facts. It often occurs when someone is faced with uncomfortable truths, such as the loss of a loved one or a serious illness. By denying these realities, individuals can temporarily protect themselves from emotional pain and anxiety. In relationships, denial can manifest when one partner ignores issues like infidelity or substance abuse. This refusal to acknowledge problems can prevent necessary conversations and hinder personal growth. Ultimately, while denial may provide short-term relief, it can lead to more significant challenges in the long run if not addressed.