Peripheral Neuropathy: This condition is characterized by damage to the peripheral nerves, which can cause tingling sensations in the feet. It can be due to various factors such as vitamin deficiencies (especially B12), alcohol abuse, or exposure to toxins. Given its relatively high prevalence and the broad range of potential causes, it stands as a likely diagnosis for tingling sensations in the feet of a non-diabetic individual.

Vitamin B12 Deficiency: A deficiency in vitamin B12 can lead to neurological symptoms, including tingling sensations in the feet. This is because B12 plays a crucial role in the synthesis of myelin, the fatty substance that surrounds and protects nerve fibers.
Hypothyroidism: This condition, where the thyroid gland doesn't produce enough thyroid hormone, can lead to peripheral neuropathy, among other symptoms, causing tingling sensations in the feet.
Vitamin D Deficiency: While less directly linked to neuropathy than B12, severe vitamin D deficiency can contribute to muscle weakness and possibly neuropathic symptoms.

Multiple Sclerosis (MS): An autoimmune disease that affects the brain and spinal cord, leading to a wide range of neurological symptoms, including numbness or tingling sensations in the feet. MS is crucial to diagnose early due to its significant impact on quality of life and the availability of disease-modifying treatments.
Spinal Stenosis or Lumbar Radiculopathy: Compression of the spinal cord or nerve roots in the lower back can cause tingling sensations in the feet. These conditions require prompt diagnosis and treatment to prevent permanent nerve damage.
Heavy Metal Poisoning (e.g., Lead or Mercury): Exposure to heavy metals can cause peripheral neuropathy. Identifying and removing the source of exposure is critical to prevent further damage.

Charcot-Marie-Tooth Disease: A group of inherited disorders that affect the peripheral nerves, leading to progressive muscle weakness and atrophy, as well as sensory loss. It's a rare condition but should be considered in cases of familial neuropathy.
Amyloidosis: A condition characterized by the deposition of amyloid (a particular type of protein) in various tissues, including nerves, leading to neuropathy. It's rare and often associated with other systemic symptoms.
Fabry Disease: A genetic disorder that results from the buildup of a particular type of fat in the body's cells, affecting many parts of the body including the nerves, and can cause tingling sensations in the feet. It's rare and typically presents with other distinctive features such as skin lesions and abdominal pain.