Brain drain is a major challenge facing the Nigerian health system, leading to a dramatic reduction in the number of doctors in the country. According to the Organisation for Economic Co-operation and Development, Nigeria is one of the three leading African sources of foreign-born physicians.

Doctors leave for a variety of reasons depending on where they are in their careers. For example, many leave immediately after graduation. They usually leave for one or two reasons. Firstly, to pursue international residency training. Most in this category usually don’t return to the country. They prefer to work where their newly acquired skills can be put to better use. The second reason is if they fail to find a job or space for residency training. Most in this category also never return home to practice.
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https://www.ekomiami.com.ng/2019/07/02/heres-why-nigerias-doctors-are-leaving-the-country-and-how-the-problem-can-be-solved/