Final answer:
The first step in the treatment of diarrhea is to start an oral rehydration solution (ORS) to prevent dehydration and restore electrolyte balance.
Step-by-step explanation:
The first step in the treatment of someone with diarrhea would be to start an oral rehydration solution (ORS).
ORS is a combination of water, salts, and sugar and is often recommended for increasing fluid intake to replace fluids lost in vomiting or diarrhea. It helps prevent dehydration and restore electrolyte balance.
Correcting the underlying medical condition and other treatments may be required depending on the cause and severity of diarrhea.