It is essential for a doctor to know a patient's medical history to make an accurate clinical decision, preferably in a short period of time. Most of the patients' medical histories are in analog forms and it is difficult for a doctor to search and find the appropriate information quickly. A doctor-friendly healthcare data visualization tool can assist a doctor in better understanding the patient's status in an accurate and quick manner. Collection, integration, and visualization of personal health data in a standard manner became technically easier due to the rapid advancement of information technologies. The objective of this research is to investigate the state-of-the-art medical history visualization tools that can support doctors. We have reviewed 25 academic papers and found 8 tools are relevant to our objective. We summarised their key features, visualization items, and mechanisms, and listed their limitations. This paper also proposes a unique visualization tool where an individual patient's medical history will be visualized in a single health Gantt chart window and the doctor can get relevant information to ensure efficient decision-making.