One of the central themes of 'Doctor In The House' is the rigorous and often overwhelming nature of medical training. Richard Gordon humorously portrays the long hours, intense studying, and the pressure to succeed that medical students face. This theme highlights the dedication and resilience required to become a doctor, while also shedding light on the human side of medical education.

Throughout the book, the importance of friendship and camaraderie among medical students is evident. Gordon's relationships with his fellow students provide support and comic relief amidst the challenges of their training. This theme emphasizes the significance of having a strong support system and the bonds that are formed through shared experiences and hardships.

Doctor In The House is filled with humorous anecdotes and situations that showcase the lighter side of medicine. From funny patient interactions to the antics of medical students, this theme brings a sense of levity to the often serious and stressful world of medical training. It reminds readers that humor can be a valuable coping mechanism and that even in the most demanding professions, there is room for laughter and joy.