A doctor prepares sanfutie, a plaster used in traditional Chinese medicine, in Tangshan, Hebei province, in July. ZHU DAYONG/FOR CHINA DAILY

HEFEI－The dog days, also known as the hottest and most sultry days of the year, have come and a new fashion has regained popularity among many Chinese who believe the best opportunity to treat diseases that often harass them when it's cold is sweating through the summer heat.

Sanfutie, a kind of plaster using traditional Chinese medicine, has been a welcome treatment as it is believed to soothe the body and help relieve the discomfort of illnesses such as asthma, bronchitis and arthritis in winter.

According to China's lunar calendar, sanfu refers to the hottest 30 to 40 days in a year, usually lasting from mid-July to mid-August.

"Today I asked for a day off for sanfutie treatment. This is my second year of having the therapy," says Shi Xuan, an asthma patient whose condition has improved notably last year after first trying the therapy.

During the process, seven medicated patches, each about the size of a credit card, were placed on his back, with another one below his Adam's apple.

"My aunt used to have asthma as well, but she got much better after receiving sanfutie treatment for five years. So, she recommended it to me," says Shi.

"The patches are placed on different acupuncture points for different diseases and are kept there for 20 to 30 minutes," says Liu Guangxia, a TCM specialist at a hospital in Hefei, capital of East China's Anhui province.