7 Myths About Bad Posture—and How to Fix It

5 Myths About Bad Posture—and How to Fix It Myth: Slouching can't actually cause long-term damage. Reality: False. Bad posture can lead to serious issues like headaches and back pains. Myth: Crossing your legs will give you varicose veins. Reality: Leg crossing can make veins show more prominently in some people, but it can also cause lower back pain. Myth: Clenching your jaw will give you TMJ. Reality: Fact. A clenched jaw can lead to headaches, neck pain, and back pain. Myth: Bad posture is genetic. Reality: Bad posture can be genetic, but you can still do exercises to mitigate the effects of slouching and get better posture. Myth: Working in front of a computer all day is ruining your posture. Reality: True. Sitting in front of a computer all day can force you to jut your neck forward and hunch your shoulders.