Given the task definition and input, reply with output. In this task, you're given five sentences, numbered 1 through 5. Your job is to generate a title for the story that makes complete sense. The title must be short, with less than three words, use simple language, and include the main topic of the story.

Sentence 1: Frances was 78 years old and did very light workouts every day. Sentence 2: She didn't sweat so she didn't think she had to drink a lot of water. Sentence 3: On July 4th, 2016 it was 100 degrees out and she went for a walk. Sentence 4: During halfway through her walk she got dizzy and fainted. Sentence 5: She woke up in the ER and the Doctors told her she was dehydrated.
Dehydration