Aching, tingling, numbness, and itching in the arms and hands can be benign or a symptom of an underlying disorder. These symptoms can suggest a systemic or neurologic cause.
Carpal tunnel and ulnar nerve compression are common causes of arm pain. Carpal tunnel syndrome is caused by repetitive wrist movements, such as typing, that cause stress to the tendons and nerves in the wrist. Ulnar nerve compression is often caused by people who lean on their elbows or rest their forearms on the edge of their table. This can result in arm pain and numbness that radiates from the forearm to the ring and little finger.
With local trauma ruled out, the likely culprits can be divided into endocrine diseases, neurologic diseases, cardiac/vascular disease, or vitamin deficiencies.
Regarding endocrine diseases, diabetes is a common cause of peripheral neuropathy where your limbs become numb secondary to nerve death. However, peripheral neuropathy usually starts affecting the lower extremities first. Your doctor can screen for diabetes by measuring your blood sugar.
Neurologic diseases such as spinal cord compression, radiculopathies, and spinal cord diseases can also cause bilateral arm pain. The likely culprits can be ruled out with a neurologic exam supplemented with x-rays and/or MRI as well as blood tests for syphillis.
Arm aches, tingling, numbness, and itching can also be a sign of arterial insufficiency or cardiac problems such as angina where chest pain is often referred to the arm.
Finally, vitamin deficiencies such as Vitamin B12 and Thiamine can cause peripheral nerve problems.
As the aching, tingling, numbness, and itching in your arm could be a sign of a serious medical condition, a full medical workup is warranted by your doctor to identify and treat the underlying cause.