It means that the dreamer is full of fear.
If you dream of thunder
Suggest that dreamers will suffer great mental suffering in the near future. The fear of thunder in dreams is the fear of reality. At this time, dreamers are more vulnerable, and some people are disheartened by messy things.
Dream of thunder
It means that the dreamer may encounter a sudden blow,
Dream of thunder rumbling
This indicates that the dreamer may have a heart disease.