What causes left pinky and ring finger to tingle when sitting or laying down?

Tingling in the left pinky and ring finger while sitting or lying down can indicate a compression or irritation of the ulnar nerve. The ulnar nerve is one of the major nerves in the arm that controls sensation and movement in the hand and fingers. It runs from the elbow to the wrist and then branches out to the pinky and ring finger.

There are several potential causes of ulnar nerve compression, including:

Cubital tunnel syndrome: This is the most common cause of ulnar nerve compression. It occurs when the ulnar nerve is compressed as it passes through the cubital tunnel, a narrow passageway between the elbow and the wrist. Cubital tunnel syndrome can be caused by repeated bending or straightening of the elbow, or by pressure on the elbow, such as from leaning on it for long periods of time.

Cervical spine conditions: Problems in the neck, such as a herniated disc or bone spurs, can also compress the ulnar nerve. This type of compression is more likely to cause tingling in both hands.

Peripheral neuropathy: This is a general term for damage to the peripheral nerves, which are the nerves that connect the spinal cord to the rest of the body. Peripheral neuropathy can be caused by a variety of conditions, including diabetes, chemotherapy, and certain medications.

If you are experiencing tingling in your left pinky and ring finger, it is important to see a doctor to determine the cause and get appropriate treatment. Treatment may include rest, physical therapy, splinting, or surgery, depending on the underlying cause.