The answer to 'tree dead trees' is that there are several common causes for dead trees, including disease, pests, drought, damage, and old age. Symptoms may include wilting leaves, bare branches, and discoloration. The best solution depends on the cause, but often involves removing the dead tree and replacing it with a new, healthy one.
If the tree is small or the issue is caught early, some homeowners may be able to treat the tree themselves. However, for larger trees or more complex issues, it's generally best to call in a professional arborist or tree service company. They can properly diagnose the problem and recommend the safest and most effective course of action.