People living in the low Himalayan hilly regions often suffer from goitre. What could be the possible reason for it ?

People living in the low Himalayan hilly regions often suffer from goi

1.	People living in the low Himalayan hilly regions often suffer from goitre. What could be the possible reason for it ?
Answer» People living in the low Himalayan hilly regions often suffer from goitre. What could be the possible reason for it ?