A printer that jams once in a while is normal. One that jams every few pages has a specific, fixable cause — it's just a matter of identifying which one.
Worn or dirty feed rollers
This is the single most common cause of repeated jams. A roller clean or replacement usually resolves this completely.
Paper that's the wrong weight or damp
Paper that's too thick, too thin, or has absorbed humidity can jam even in a perfectly healthy printer.
Overloaded paper tray
Stuffing the tray past its marked fill line causes multiple sheets to feed at once.
Torn or curled paper edges
Fan the stack before loading it and check for damaged edges.
A foreign object or torn scrap stuck inside
A previous jam that wasn't fully cleared can leave a scrap lodged inside, causing repeat jams at the same point.
When to bring it in
If cleaning the rollers and checking your paper doesn't solve it, that's usually a sign of an internal fault worth a proper inspection.