The most common cause of vocal cord palsy is -
In unilateral paralysis, left recurrent laryngeal nerve is more prone to paralysis compared to the right one because of its much longer course.
Most common overall cause of vocal cord paralysis is iatrogenic in origin following surgery, most commonly thyroidectomy.
Most common cause of unilateral left vocal cord paralysis is bronchial carcinoma at the left hilum.
Total thyroidectomy
Bronchogenic carcinoma
Aneurysm aorta
Tubercular lymph nodes