As of March 2026, Hendrick Motorsports driver Alex Bowman is missing NASCAR Cup Series races due to a diagnosis of vertigo.
Hendrick Motorsports

The vertigo, which causes severe dizziness and impairs balance and vision, forced him out of the car during the road course race at Circuit of the Americas (COTA) in early March 2026.
Hendrick Motorsports

Key Details on Bowman's Situation:
Lingering Symptoms: Despite working with specialists, Bowman has continued to experience symptoms, leading to missed races at Phoenix, Las Vegas, and several upcoming events (Darlington, Martinsville, and Bristol).
Medical Team Guidance: Hendrick Motorsports stated they are following medical advice and prioritizing his health over a quick return.
Previous Injuries: This is not his first time missing races, having previously been sidelined in 2022 and 2023 due to a concussion and a broken back.

I seem to remember another HMS driver who retired early for the same reasons. Bowman took his car over. (Dale Jr)