A tourist from Bangkok passed out and was saved by health officials an hour after she took a shower in cold weather at popular Phu Thap Boek.
A staff member of the Phu Thap Boek tourism community alerted Wanchai Chayarom, the village chief of Moo 16 on the mountain, about a tourist fainting on Saturday morning.
The incident took place as temperatures on the mountain in Lom Kao district in Phetchabun dropped to 4°C, the coldest this year.
The village headman tried to drive a pickup to collect a health official at Thap Boek health office four kilometres away to help the tourist but later switched to a motorcycle due to heavy traffic on the mountain.
There was no word from the officials as to the cause of the woman's collapse.
Lom Kao district chief Somluck Yoknoiwong said the tourist was saved. He said she fainted because she could not stand the cold weather while taking a shower.
The tourism community, which groups villages on the mountain to provide services for visitors, has no water heaters to serve tourists.
The tourist, whose name was withheld, returned to Bangkok with her family after she recovered, according to Mr Wanchai.