welcome to healtcare magic
sometimes extra riyaz can cause stress
on vocal cords and also damage to them ...in your case you should take care for the vat and kaf dosha in your body as them have thier dominace in this place .
. omkara jap in mild tone
. yashtimadhu (glyyceriza glabra) warm deotion gargles twice a day for 15 days
.if possible maun(being silent) sa much time possible
some other medicine or dit regime may be needed after assessing your body pattern
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