Right-side sleeping effect: For most people, right-side sleeping does not cause palpitations. In fact, some people with palpitations on their left side find relief on their right side.
The exception: People with certain structural heart conditions (like a large pericardial effusion or severe cardiomyopathy) may experience different symptoms depending on position. This is rare.
Who is most at risk: Healthy hearts are fine. People with known heart conditions should follow their doctor’s advice.
What you can do: If you feel palpitations, note your position. Try changing sides. If palpitations are frequent or accompanied by chest pain, shortness of breath, or dizziness, see a doctor.
5. Arm Numbness, Shoulder Pain, or Thoracic Outlet Syndrome
This is less about internal organs and more about mechanics.
What happens: When you sleep on your right side, you put your full body weight on your right shoulder and arm. This can compress nerves and blood vessels, leading to:
