Internal medicine is the medical speciality concerned with the diagnosis, management and nonsurgical treatment of various diseases afflicting human body in general.

Physicians at NHI are trained to diagnose and treat acute and severe chronic illnesses and handle situations where several different illnesses may strike at the same time. They also bring to patients an understanding of preventive medicine, men's and women's health, substance abuse, mental health, as well as effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs besides special focus on:

• Cardiology, dealing with disorders of the heart and blood vessels
• Endocrinology, dealing with disorders of the endocrine system and its specific secretions called hormones
• Gastroenterology, concerned with the field of digestive diseases
• Haematology, concerned with blood, the blood-forming organs and its disorders
• Infectious diseases, concerned with diseases caused by biological agents such as by a virus, bacterium or parasite
• Medical oncology, dealing with the study and treatment of cancer
• Nephrology, dealing with the study of the function and diseases of the kidney
• Pulmonology, dealing with diseases of the lungs and the respiratory tract
• Rheumatology, devoted to the diagnosis and therapy of joint pains, limitation of function and deformities of various joints of the body