Over 100 garment workers fell ill and passed out at clothing factories in Cambodia on Thursday, police told Reuters.

There is no official reason as to why the garment workers fainted, but several reasons including food poisoning, toxic chemicals used to manufacture clothing and unsafe working conditions are suspected.  

At least 118 garment workers passed out Thursday while working at the Shen Zhou and Daqian Textile factories in the capital Phnom Penh, police told Reuters. According to the labor rights group Community Legal Education Center, over 200 workers passed out this week alone.

One garment worker, Nguon Sarith, was connected to an intravenous drip at a hospital in Phnom Penh.

"It was hot and I began to vomit, I had diarrhea and others had the same problems," Sarith, 30, told Reuters. Sarith said she thinks food poisoning made her sick.

Two of the factories where workers fell ill are confirmed to have produced clothing for Puma SE and Adidas, Reuters reported. Both sportswear brands said employees received medical treatment while they conducted an investigation.

Puma said it communicated with local authorities, and that food samples from Shen Zhou are to be tested in a laboratory for contamination, Reuters reported.

Cambodia's garment industry rakes in over $5 billion a year in revenue. But the nation's garment workers, some 600,000, often fall sick on the job. Employees have complained about poor ventilation and the use of too-powerful glue for footwear, Reuters reported.

The garment industry has also seen a recent uptick in protests against low wages, which is less than $100 per month for most garment workers.

An upcoming strike, scheduled for April 17, will involve 18 unions as they call for an increase in pay to $160 a month. But protest efforts have been met with severe reactions from police, including a Jan. 3 strike that ended with five workers being shot and killed, Reuters reported.