Which of the following is not true about Bell&;s palsy

Sixty to seventy-five per cent of facial paralysis is due to Bell palsy. It is defined as idiopathic, peripheral facial paralysis or paresis of acute onset. Both sexes are affected with equal frequency. Any age group may be affected though incidence rises with increasing age. A positive family history is present in 6-8% of patients. Risk of Bell palsy is more in diabetics (angiopathy) and pregnant women (retention of fluid). Ref : Dhingra 7e pg 103.