The hose in my kitchen sink suddenly leaks when I run the faucet. Any idea why & how I might fix it?

You mean the inlet hose leaks? Replace the inlet hose

Hi Druanne and welcome, You're talking about your removable sprayer, Right? They are readily available at big box stores and easy to change. If I'm right post back with type of faucet and we can help with the change out. Good luck