Dropping leaves are like the fever-and-stuffy-nose symptom equivalent of the plant world. It can mean anything. Maybe it’s just allergies, but it might also be the flu. Or it might be nothing. Even healthy plants drop leaves sometimes. So if your plant loses a leaf here and there, don’t panic. Don’t even bat an eye. But if your plant is losing a bunch of leaves at once and showing signs of discomfort like yellowing and limpness, you need to investigate. Start with the most common culprit: water. Overwatering is frequently the cause of falling leaves, but it could also be underwatering. If you’re sure watering is not the problem, reconsider the light source. Move your plant to a brighter spot and see if it picks up. If it is in a particularly drafty spot, give it some protection from the cold and see if things improve. Another possibility is that your plant is low on nutrients and therefore can’t support all its leaves. If you have recently potted your plant, this is unlikely, but if it’s been a couple of years there’s a possibility your plant has outgrown its pot and/or used up all the nutrients in the soil. If that’s the case, you should notice the leaves turning lighter in color before they start to drop. A dose of fertilizer or a pot upgrade may be in order.