Subarachnoid hemorrhages (SAHs) are grave medical emergencies, whereas 30–50% of all SAHs may ultimately result in death. Subarachnoid hemorrhages share many resemblances with other neurological traumas such as a cerebral vascular accident, meningitis, and/or traumatic brain injury. Autoimmune encephalopathies (AE) occur when human antibodies assault the body’s cell surfaces and/or synaptic proteins. Consequently, widespread nervous system and diffuse brain involvement may occur. With subarachnoid hemorrhages and autoimmune encephalopathies, multiple areas of cognition and language can be impaired. Case studies in communication sciences and disorders are underutilized, yet are important in evidenced‐based practice. Speech-language pathologists in medical settings have worked with patients and families with similar types of disorders. Therefore, speech‐language pathologists should be well equipped to provide therapy with these types of injuries. This chapter presents two case studies and cognitive language rehabilitation strategies following diffuse brain injuries.