Left-sided peripheral neuropathy: This is a common condition that can cause tingling sensations due to damage to the nerves. It can be caused by various factors such as diabetes, vitamin deficiencies, or trauma.

Multiple sclerosis: An autoimmune disease that affects the central nervous system, causing symptoms such as tingling, numbness, and weakness.
Stroke or transient ischemic attack (TIA): A decrease in blood flow to the brain can cause tingling sensations on one side of the body.
Cervical radiculopathy: Compression or irritation of the nerves in the cervical spine can cause tingling sensations on the left side of the body.
Left-sided carpal tunnel syndrome: Compression of the median nerve in the wrist can cause tingling sensations in the hand and arm.

Brain tumor: A tumor in the brain can cause tingling sensations, among other symptoms, and is a potentially life-threatening condition if left untreated.
Spinal cord injury or compression: Compression or injury to the spinal cord can cause tingling sensations, as well as other symptoms such as weakness, numbness, and loss of bladder or bowel control.
Vascular malformation: Abnormalities in blood vessels, such as arteriovenous malformations (AVMs), can cause tingling sensations and are potentially life-threatening if left untreated.

Syringomyelia: A rare condition characterized by the formation of a fluid-filled cavity within the spinal cord, which can cause tingling sensations, among other symptoms.
Lyme disease: A bacterial infection that can cause tingling sensations, among other symptoms, if left untreated.
Vitamin B12 deficiency: A deficiency in vitamin B12 can cause tingling sensations, among other symptoms, and is more common in certain populations such as vegetarians and vegans.