Post-viral neuropathy or neuritis: This condition can occur after a viral infection, such as a URI, and may cause tingling sensations on one side of the body. The justification for this diagnosis is the temporal relationship between the URI and the onset of tingling, as well as the relatively common occurrence of post-viral neuropathies.

Multiple sclerosis (MS) or clinically isolated syndrome (CIS): MS is an autoimmune disease that can cause a wide range of neurological symptoms, including tingling. A URI could potentially trigger an MS relapse or be the initial presentation of CIS. The justification for including MS in the differential is the possibility of an autoimmune response triggered by the viral infection.
Vitamin B12 deficiency: This condition can cause neurological symptoms, including tingling, and may be exacerbated by a viral infection. The justification for considering vitamin B12 deficiency is the potential for decreased appetite or absorption during a URI, leading to a deficiency.
Anxiety or panic disorder: Anxiety can cause tingling sensations, and a URI could potentially trigger or exacerbate anxiety symptoms. The justification for including anxiety in the differential is the psychological impact of illness and the potential for somatic symptoms.

Stroke or transient ischemic attack (TIA): Although less likely, a stroke or TIA could cause unilateral tingling and must be ruled out due to the potential for severe consequences if missed. The justification for including stroke or TIA in the differential is the importance of promptly identifying and treating these conditions to prevent long-term damage.
Guillain-Barré syndrome: This rare autoimmune disorder can cause ascending paralysis and tingling, often following a viral infection. The justification for considering Guillain-Barré syndrome is the potential for severe neurological consequences if not promptly diagnosed and treated.
Spinal cord injury or compression: Trauma or other conditions affecting the spinal cord could cause tingling on one side of the body. The justification for including spinal cord injury or compression in the differential is the potential for serious neurological consequences if not promptly addressed.

Sjögren's syndrome: This autoimmune disorder can cause neurological symptoms, including tingling, and may be associated with viral infections. The justification for considering Sjögren's syndrome is the potential for autoimmune sequelae following a viral infection.
Lyme disease: In endemic areas, Lyme disease could cause neurological symptoms, including tingling, following a viral-like illness. The justification for including Lyme disease in the differential is the potential for tick-borne illnesses to present with non-specific symptoms.
Neurosarcoidosis: This rare condition can cause a wide range of neurological symptoms, including tingling, and may be associated with viral infections. The justification for considering neurosarcoidosis is the potential for autoimmune or inflammatory sequelae following a viral infection.