At least eight people in NSW have been admitted to hospital after being poisoned by wild mushrooms in the past week, prompting a warning from authorities.

The NSW Poisons Information Centre said five of those were the result of intentionally eating mushrooms foraged from fields. The other three were children who accidentally picked them and decided to try them.

Death Cap mushrooms can cause serious poisoning and potentially fatal organ damage. Credit:Arsineh Houspian

"If not properly identified, mushrooms picked in the wild can make you very ill and could be lethal, so people should only eat shop-bought mushrooms," co-head of the centre Genevieve Adamo said on Wednesday.

"Cooking or boiling wild mushrooms does not make them safe to eat," she said.