For some trees, the symptoms of decay or disease are prominent—new leaves don’t appear in the spring, or branches become dry. Other times, it is less noticeable your tree is in poor health, usually due to internal damage or disease. Decaying trees can pose a real danger to you and your family. You should remove them to avoid any severe accidents. Some of the most common signs of an unhealthy tree are: Dead leaves clinging to branches A tree that is starting to lean (possible root damage) Vertical cracks Branches sprouting from the tree’s base Leaf discoloration