Do not avoid talking about your professional reasons for applying to an opportunity in your cover letter.
Use this as a format for you to explain why this opportunity matches up with your professional goals.
I am fully qualified and experienced and believe I would be a valuable addition to your team.
I graduated with a First Class Honors degree from the Mid Western Medical School and completed my residency at Mid West Hospital working primarily in the pediatric department.
Since I started my professional career every appraisal and report on my work has come out with the highest marks and standards.
I apply my high level of practical knowledge and skill to delivering medical solutions in a very human way, taking time to understand each patient and their needs.
You should use your cover letter to highlight your key skills and desirable traits that make you the right candidate for the opportunity.
For example, if the employer is looking for someone who is bilingual and specializes in a procedure and you match that description, point it out in your cover letter. Just like your CV, your cover letter should be tailored to each opportunity you apply for.
Mentioning your personal reasons and family in a cover letter is normal.
This helps employers see you as more than just a physician.