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What are the causes for voice change ?

1.allergic laryngities 
2.heavy smoking 
3.recurrent upper respiratory tract infectin 
4.high testerone level 
5.isualted recurrent laryngeal nerve which control vocal cords 
6.increase thyroid gland size 

What are the investigation ?

1.bronchoscopy 
2.chest x ray 
3.neck ultrasound and for thyroid 
4.testerone level 
5.EEG for nerve root 

What are the treatments ?

1.antibiotic as levoflaxcin 750 once daily for 7 days 
2.stop smoking 
3.cetrazine or loratidine once daily 
4.mucosolvant 3 times daily 
5.strepsils 4th times daily 
6.spirnolactone as antiadrengic drugs
7.treat thyroid problems as surgical excision or cerbemezapine