Asthma (ぜんそく zensoku), as well as being an ailment that presents itself in real life, is a status ailment in EarthBound Beginnings. Asthma will cause Ninten, the only playable character in the game who can be affected by the ailment, to miss turns while in combat. It is only caused by certain attacks used by the vehicular enemies around Merrysville (Thanksgiving), and only lasts for the duration of the current battle. It can be temporarily cured by having another party member use an AsthmaSpray on Ninten. But, he can also use the spray himself.
(See for real life condition)