How do you tell if a tree needs to be cut down?

Firstly, assess for any dead or decaying branches, which could potentially fall and cause harm. Secondly, watch for signs of disease or pest infestations, such as peeling or discolored bark, or the presence of insects. Thirdly, consider the tree's proximity to buildings, power lines, or other important structures, as it may pose a safety or property risk. If the tree is noticeably leaning or displays a significant crack in the trunk, it's advisable to seek evaluation from a professional arborist to determine if removal is necessary.