Friendships can be a powerful source of comfort, laughter, and emotional support, but not every social circle is healthy. In fact, research from the American Psychological Association has repeatedly shown that strong relationships affect mental well-being, stress levels, and even physical health. When a friend group becomes emotionally draining, controlling, or competitive, the impact can be deeper than many people realize. Recognizing the warning signs of toxic female friendships can help you protect your confidence, boundaries, and peace of mind.