With temperatures reaching the 90s yet again, EMS workers say they've been extra busy treating heat-related illnesses.

"We get to make a difference every day, whether it's helping an old lady or bringing someone back from the dead," says Lt. AJ Briones, a paramedic with Empress Emergency Medical Services for the past five years.

As temperatures rise, so do emergency calls: Reports of things like heat exhaustion have spiked by about 20 percent this week over last, he says.

Experts say people should drink at least eight glasses of water a day on a normal day. During high temperatures, they need even more. 

But staying hydrated also means avoiding caffeine, Briones says.

"Coffee actually dehydrates you," he says. "Coffees, teas, sodas -- anything like that."

Dr. Justin Bennett from St. Joseph's Medical Center has other advice for avoiding heat-related illnesses.

"Stay inside and keep your air conditioner on," he says.