Normal lower-leaf loss as it grows. Only worry if it’s dropping leaves from the top or many at once. Otherwise let it be.
What’s causing it
A recent change or shock
How to tell
It started dropping leaves soon after you bought, moved, or repotted it, or when the seasons turned.
The fix
Pick a suitable spot, keep care steady, don’t fertilize, and let it adjust over a couple of weeks. Many plants settle once conditions stop changing.
Overwatering
How to tell
Leaves yellow and then drop, and the soil stays wet for days after watering.
The fix
Ease off watering, check drainage, and inspect for rot in the roots if it feels soft.
Underwatering
How to tell
Leaves crisp, curl, and drop, and the soil is bone dry alongside crispy leaf tips.
The fix
Water thoroughly and then keep it more consistent.
Cold drafts or temperature swings
How to tell
It’s near a frequently-opened door, a cold window, or a heat source, and drops leaves in cold snaps.
The fix
Move it somewhere with stable, draft-free temperatures.
Prevention
Losing a few lower leaves as it grows taller is normal. Worry only about sudden drops from the top. Keep watering consistent and protect it from cold drafts.