Some of the causes of tingling in the left arm and hand or both arms and hands, include diabetes, nerve entrapment syndromes, systemic diseases and vitamin deficiencies, according to WebMD. Other causes include alcoholism, toxins, infections and injury.
Diabetes is a common cause of tingling in the arms and hands, but it typically begins in the feet and moves up through the body, WebMD explains. Nerve entrapment syndromes, such as carpal tunnel syndrome, may also cause tingling and numbness in the arms and hands. It is also possible for systemic diseases, such as liver diseases, kidney disorders and blood diseases, to cause numbness and tingling in the body. Tumors are also known to cause tingling.
Vitamin deficiencies can cause tingling on the left side of the body, including in the arms and hands, states WebMD. Deficiencies with niacin and vitamins E, B-12, B-1 and B-6 cause the condition, but too much B-12 in the body may also lead to tingling and numbness. Alcoholism is another cause of tingling and numbness in the body and is either directly from the alcoholism or due to the behavior of alcoholics, such as not getting proper nutrition. Toxins such as heavy metals or chemotherapy drugs in the body can also cause tingling in the arms and hands, as can injuries to the nerves or diseases such as lupus or Guillain-Barre syndrome.