Manual therapy on Site of Pain. Physical Therapy
07/05/2026
WHY YOUR ARM SUDDENLY GOES NUMB
It may feel like:
• tingling
• loss of sensation
• weakness
• heavy arm feeling
Sometimes… it happens after sleeping or certain neck positions.
🦴 THE ANATOMY
This can involve the **Brachial Plexus**.
It is a network of nerves that starts in the neck and travels into the shoulder and arm.
These nerves control sensation and movement in the upper limb.
⚙️ THE BIOMECHANICS
When these nerves become compressed or stretched:
1️⃣ nerve signals may slow down
2️⃣ sensation changes in the arm
3️⃣ weakness or numbness may appear
Neck and shoulder position can influence these nerves.
Possible signs include:
• arm tingling
• numbness
• weakness in the hand or arm
• symptoms linked to neck position
💡 THE TAKEAWAY
A major nerve network from the neck controls the arm, and pressure on these nerves can affect sensation and strength.
