Why Does My Elbow Hurt When Straightening My Arm After Sleeping?

When you sleep, your arm might stay in a position that puts pressure on your elbow joint or nearby nerves. This can cause your elbow to become stiff overnight, making it painful to straighten. Such stiffness typically happens when muscles and tendons remain in the same position for too long. Your nerves may become compressed when you lean on your arm or keep it bent while sleeping. When the pressure is released and the nerve begins to "wake up," you might feel pain or discomfort. Don't worry—this is common and temporary. The symptoms typically fade as you move your arm around. If the pain continues or gets worse, you should see a healthcare provider for a proper evaluation.