Human brain and language are closely related to each other as normal speech production is hampered when brain receives an injury. The names of Paul Broca and Carl Wernick are closely associated with the research of brainlanguage relationship. To find out the practicality of their research it is necessary to study of some cases regarding Broca’s aphasia and Wernick’s aphasia. This article has attempted to analyze the symptoms of aphasia, to explore how this influence language and cognitive behaviors. Based on interviewing three patients the findings reveal that if left hemisphere of human brain gets any trauma normal language production is hampered. The article ends with some suggestion to help the patient’s surroundings recovering language soon.