FLVCR1 and amyotrophic lateral sclerosis: This study identified a causal relationship between genetically predicted hemoglobin (Hb) concentration and amyotrophic lateral sclerosis (ALS) through Mendelian randomization (MR), and integrated RNA‐seq and RT‐qPCR analyses to highlight BACH1, FLVCR1, and TRIM58 as potential genes involved in this association.