In addition, the lack of oxygen intake into the nail matrix can also cause clubbing nails, a condition marked by the nail surface being convex and curved, the nail tips rounded without angles. Lack of long-term oxygen levels (chronic hypoxia), especially in the periphery of the fingers, will stimulate the brain to dilate blood vessels in the fingers. The condition of this tabuh finger is permanent and indicates the possibility of lung disease and congenital heart.
In addition to heart and lung problems, this disorder can also be caused by gastrointestinal disturbances (malabsorption, Chron disease, cirrhosis, hepatopulmonary syndrome as a complication of cirrhosis) or hyperthyroidism.