Why does your left arm go numb at night?

Your left arm going numb at night could be caused by a few different reasons. Here are some possible causes:

1. Thoracic outlet syndrome (TOS) occurs when the blood vessels and nerves between your neck and shoulder get squeezed. This can cause various symptoms, including numbness and tingling in your left arm, pain in your neck and shoulder, and decreased strength in your hand.

2. Cervical radiculopathy refers to damage or irritation of the nerves that come out of your spinal cord between your neck bones. This can also cause numbness in your left arm, as well as neck pain, headaches, and difficulty moving your arm.

3. Carpal tunnel syndrome (CTS) This is a condition that occurs when the median nerve becomes compressed as it passes through the carpal tunnel in your wrist. This can cause numbness, tingling, and pain in your left arm, wrist, and hand.

4. Peripheral neuropathy This is a type of nerve damage that can affect multiple areas of the body, including your left arm. It can cause various symptoms, including numbness, tingling, weakness, and pain.

It's important to see a doctor for an evaluation if you're experiencing left arm numbness to determine the cause and receive proper treatment.