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 Lok 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. (continues below)
Morning frost is seen on plants at Phu Thap Boek on Sunday morning. (Photo from Wanchai Chayarom)
The drop in temperature to 4°C on Phu Thap Boek, however, was a delight for other tourists as they had a chance to see frozen dew for the first time this year on the mountain.
Located 1,667 metres above sea level, Phu Thap Boek is a popular destination for tourists especially during long weekends when the mountain is flooded with vehicles.
The government is carrying out a crackdown on illegally built resorts in the area because of damage to the environment.