As mentioned before, there are several common signs that a tree may need to be removed. Severe leaning in one direction, fungus, growths, a hollowed-out trunk, or large sections of dead limbs and branches are all indications of poor tree health.  Trees may also need to be removed if they are causing an obstruction or posing a risk, such as growing too close to your home or a powerline. Consulting an ISA certified arborist is the best way to determine what the best course of action is for problem trees on your property.