Allergies are a common cause of hives since an allergic reaction can trigger the immune system response that results in trapped fluid beneath the skin.An allergic reaction can occur due to something you ingested or were exposed to through the air.hoto Credit pollen image by asb from Fotolia.com. Allergies are a common cause of hives since an allergic reaction can trigger the immune system response that results in trapped fluid beneath the skin. An allergic reaction can occur due to something you ingested or were exposed to through the air.
The median nerve, which runs through the arm and hand, can cause swelling pain and numbness if injured. Ulnar nerve injury Damage to the ulnar nerve causes swelling, pain and numbness in the forearm, hand, and ring and little fingers.
This nerve gives sensations to the fingers and innervates forearm and hand muscles that enable you to hold an object between your forefinger and the thumb. Any numbness, tingling, impingement, or pinching in the median nerve will lead to pain in the fingers, hand, and forearm. The first symptom is fingers falling asleep or becoming numb at night. The numbness and pain may extend to the forearm and sometimes to the shoulder. 8. Other Causes. Diabetes causes arms or hands and feet to fall asleep even when one is awake and relaxed. Hand surgery and arthritis damage or irritate the nerves.