The symptoms for overwatering usually look like the plant is suffering from drought. The plant appears to wilt and the leaves turn yellow or brown and fall off. However, with overwatering there are usually distict brown tips and edges to the leaves. The roots look disintergrated, like rotten string.
Overwatering or poor drainage which means the plant drowns and suffocates from lack of oxygen.
Death, if not caught early enough and remedied.
Improve drainage by adding grit or organic matter to heavy soil. For potted plants make sure there are drainage holes in the bottom of the pot and that they have not become clogged up. Reduce amount of water given to the plant.