Title: What causes numbness in the left arm and hand? - Blog | Everlywell: Home Health Testing Made Easy
Headings: What causes numbness in the left arm and hand?
What causes numbness in the left arm and hand?
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What causes tingling in the left arm?
Inadequate blood flow
Nerve injuries
Hypothyroidism
Herniated disc
Vitamin B12 deficiency
Fractures
Carpal tunnel syndrome
Cubital tunnel syndrome
Diabetic neuropathy
Multiple sclerosis
Stroke
What to do if you experience numbness or tingling in the left arm

Content: Hypothyroidism results from the underproduction of thyroid hormone by the thyroid gland, and can also lead to symptoms like fatigue, cold sensitivity, weight gain, dry skin, and more. Easily test the 3 main thyroid hormones (plus thyroid antibodies) with the Everlywell at-home Thyroid Test —and conveniently access your results on our secure, online platform. Herniated disc
A herniated disc located near nerves that run through your left arm may cause your arm to tingle and feel numb. Risk factors associated with this condition include repetitive bending or twisting of the lower back, lifting heavy objects, smoking, and having a physically inactive lifestyle. Vitamin B12 deficiency
Vitamin B12 is a key nutrient that helps the nervous system function well, so it probably doesn’t come as too much of a surprise that a B12 deficiency can lead to paresthesia—a tingling feeling or numbness that typically affects the arms, hands, legs, or feet. The recommended dietary allowance for vitamin B12 is 2.4 mcg per day for adult men and non-pregnant women. Vitamin B12 is found in many animal products including fish, poultry, eggs, meat, and milk—and it’s also available as a nutritional supplement for those who need to boost their intake but don’t get enough of this vitamin from dietary sources. Fractures
A bone fracture in your arm can cause inflammation, swelling, and pain, and interfere with nearby nerves, causing numbness and tingling. Other symptoms of a fracture in the arm include a misshapen arm, a visibly out-of-place joint, bleeding, a protruding bone, limited mobility in the arm, and the inability to move the arm. If you suspect you have a bone fracture, seek medical attention right away.