Dysdiadochokinesia is the inability to perform quick, alternating movements, such as opening and closing a fist or tapping a foot. It is usually a symptom of an underlying health condition that ...

Dysdiadochokinesia (DDK) is the medical term used to describe difficulty performing quick and alternating movements, usually by opposing muscle groups. It’s pronounced “dis-di-ad-o-ko-ki-nee-ze-a.” ...