First try to identify what type of drawers and guilds you have.
Wood Drawers Guilds
Wood drawer guilds are the most common that stick. Adding wax to the wood runners usually will solve the problem.
Metal Drawer Guilds
Metal drawer guilds over time may start sticking or not working smoothly. you need to spray a dry silicone spray on
the rollers and in some cases try a little lithium gease on the runners. this will make your drawer work smoothly again.
Plastic Drawer Hardware
Some drawers have small plastic guilds or rollers. Sometimes these break and parts may need to be purchased
at a good hardware store.