Anatomical Secondary to structural changes, Choking, Strangulation other Accidental causes, Thyroid,Parathyroid thymus or any neck lesions can lead to voice problems.
Thyroid and parathyroid glands
Physiological:Exessive use, dehydration,Insomnia,Deconditioning etc
Psychological: Anxiety,Neurosis,Fear, Phobias, Dysthimia, Depression etc.,
Central Causes:Brain damage secondary to Stroke,Tumors, Infection, Abcess especially at the temporal region of the brain.Head Injuries like Skull fracture, Concussion, Hemtoma even blunt injuries can lead to problems with voice.
Any lesions around or within the lobe can lead to speeech and voice problems.
Any damage to the nerves supplying the larynx can lead to voice problems.
Can also result from brain stem lesions.
Motor Neuron disease: