Qeexida qaamuuska ereyga "cudur" waa cillad ama xaalad aan caadi ahayn oo ku jirta noolaha taas oo saamaysa hawlaheeda jireed ama maskaxeed oo inta badan lala xiriiriyo calaamado gaar ah ama calaamado. Cudurrada waxaa sababi kara arrimo kala duwan sida hidde-sideyaasha, caabuqyada, arrimaha deegaanka, iyo doorashada qaab nololeedka. Tusaalooyinka cudurrada qaarkood waxaa ka mid ah kansarka, cudurrada wadnaha, sonkorowga, iyo cudurka Alzheimers.