The prognosis for language delay varies depending on the cause of the delay. Language delays due to disease, such as those involving intellectual and neurological abnormalities of the brain, do not usually heal on their own. If left untreated, it can further affect the child’s growth, intellectual development and other neurological development. For example, speech delay caused by hearing impairment does not usually heal on its own, and the more severe the hearing impairment, the more severe the child’s speech impairment will be. In contrast, language delays caused by a disconnected language environment can gradually heal on their own if language attention and corresponding language stimulation are given early in development and supplemented with corresponding speech training. However, if the appropriate language environment does not return in time or appears too late, the child may be unable to acquire normal language for the rest of his or her life. If a child has symptoms such as late speech, late increase in words, or difficulty understanding abstract words, he or she should be seen by a neurologist as soon as possible to avoid missing the best time for language rehabilitation.