1. According to its traditional grouping
1.1. They are traditionally divided into
1.1.1. clinical
1.1.2. surgical
1.1.3. laboratory
2. According to the place of professional practice
2.1. Hospital
2.1.1. doctors who work in hospitals
2.1.1.1. outpatient centers
2.1.1.2. specialty centers
2.1.2. Primary care
2.1.2.1. physicians practicing in health centers
2.1.2.2. clinics
2.1.2.3. general practitioners or family doctors.
3. Clinical specialties
3.1. they personally assist the patient with preventive, diagnostic and therapeutic activities, generally using surgical techniques.
3.1.1. Allergology
3.1.2. Anesthesiology
3.1.3. Angiology
3.1.4. Cardiology
3.1.5. Endocrinology
3.1.6. Stomatology
3.1.7. Gastroenterology
3.1.8. Genetics
3.1.9. Geriatrics
3.1.10. Hematology
3.1.11. Hepatology
3.1.12. Infectology
3.1.13. Aerospace medicine
3.1.14. Sports medicine
3.1.15. Family and community medicine
3.1.16. Physical medicine and rehabilitation
3.1.17. Forensic Medicine
3.1.18. Intensive medicine
3.1.19. Internal Medicine
3.1.20. preventive medicine and public health
3.1.21. Work Medicine
3.1.22. Nephrology
3.1.23. Pneumology
3.1.24. Neurology
3.1.25. Nutriology
3.1.26. Medical oncology
3.1.27. Radiation Oncology
3.1.28. Pediatrics
3.1.29. Psychiatry
3.1.30. Rheumatology
3.1.31. Toxicology
4. According to its orientation
4.1. age groups
4.1.1. pediatrics
4.1.2. geriatrics
4.2. apparatus or systems of the human body
4.2.1. pulmonology
4.2.2. angiology
4.3. diagnostic techniques
4.3.1. radiology
4.3.2. microbiology
4.4. therapeutic and rehabilitative techniques
4.4.1. pharmacology
4.4.2. surgery
4.4.3. dentistry and trauma
4.4.4. rehabilitation
4.4.5. hydrology
4.5. specific diseases
4.5.1. infectology
4.5.2. allergology
4.5.3. psychiatry
4.6. human activities
4.6.1. occupational medicine
4.6.2. sports medicine
4.6.3. legal medicine
4.6.4. preventive medicine
5. Surgical specialties
5.1. They correspond to the figure of a surgeon, and use invasive means to physically treat, modify or remove the pathological structure.
5.1.1. Heart surgery
5.1.2. General Surgery
5.1.3. Oral and maxillofacial surgery
5.1.4. Orthopedic surgery
5.1.5. Pediatric surgery
5.1.6. Plastic surgery
5.1.7. Thoracic surgery
5.1.8. Vascular surgery
5.1.9. Neurosurgery