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Diagnosis

Your Monstera with leaves falling off and yellow leaves

MonsteraLeaves falling offYellow leaves

Based on what you've described, these are the likeliest causes — ranked. Each one carries a tell-tale sign that distinguishes it from the others, and a single-minute check to confirm.

1Most likely

Overwatering

The soil has stayed wet for too long, suffocating the roots and weakening the plant from the base up. It's the most common reason houseplants decline indoors, and it looks deceptively similar to thirst: a wilting plant in soggy soil is almost always drowning, not dry.

Tell-tale sign
Soil is wet more than an inch deep, and the lower leaves yellow or soften before the upper leaves change.
60-second check
Push a finger two inches into the soil. If it comes out cool and damp, the plant doesn't need water; it needs to dry out.
2Most likely

Root rot

Persistent soggy soil has killed part of the root system, and the fungal infection that follows is now attacking what's left. It's the advanced stage of overwatering: the plant is wilting because it physically cannot pull water up anymore, even from wet soil.

Tell-tale sign
The plant wilts even though the soil is wet, and the base of the stem feels soft or smells sour when you press it.
60-second check
Slip the plant out of its pot. Healthy roots are firm and pale; rotted roots are dark, mushy, and pull apart easily.
3Also possible

Underwatering

The plant has been dry for long enough that cells have lost turgor and leaf tissue is starting to die back at the margins. Drought-tolerant species forgive this; thirsty species like peace lily or fiddle leaf fig do not.

Tell-tale sign
The pot feels unusually light when you lift it, and the leaves are crisp rather than limp.
60-second check
Lift the pot. If it feels airy and the soil has pulled away from the pot's edges, the roots are bone-dry.
Read deeper
Watering can pouring water over a healthy green houseplantWatering

How Often Should You Water Houseplants? A Practical Guide

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Dense tangle of exposed plant roots — the kind of root mass you uncover when lifting a plant to check for rotTroubleshooting

Root Rot in Houseplants: How to Identify, Save, and Prevent It

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Hand holding a yellowing houseplant leaf for inspectionTroubleshooting

Why Are My Plant's Leaves Turning Yellow? A Complete Diagnosis Guide

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Canonical combo: dropping-leaves--yellow-leaves