Hi,
Hemifacial spasm is a very rare disease and it usually effects at around 50-60 years of age but it can effect even young also. It usually starts from eyes and then effects to lower face(lips) and other muscles. Hemifacial spasm can be diagnosed with complete neurological exam and with the help of EEG.
Otherwise the causes can be -
1) Potassium deficiency
2) Work stress
3) Over emotional
4) Nervousness
5) Tiredness
6) At times facial nerve might be affected(cause might be infective or no ...
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