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| 1900 |
| | | The Bayer company in Germany sells aspirin in the form of water-soluble tablets, the first medication of its kind | |
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| 1900 |
| | | Sigmund Freud publishes one of his most significant works, The Interpretation of Dreams | |
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| 1900 |
| | | The Russian physiologist Ivan Pavlov keeps dogs alive almost indefinitely by severely curtailing their bodily functions | |
|  | Five experimental dogs in Pavlov's laboratory
Wellcome Library, London
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| 1903 |
| | | German surgeon Georg Clemens Perthes discovers, in Leipzig, that X-rays can inhibit cancer | |
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| 1903 |
| | | Dutch physiologist Willem Einthoven invents the galvanometer, or electrocardiograph, for recording the electrical impulses within the heart muscle | |
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| 1904 |
| | | Austrian psychologist Sigmund Freud publishes The Psychopathology of Everyday Life | |
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| 1906 |
| | | German immunologist August von Wasserman develops a diagnostic test to reveal the presence of the syphilis spirochaete in the blood | |
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| 1906 |
| | | Belgian physiologists Jules Bordet and Octave Gengou identify Bacillus pertussis, the bacterium causing whooping cough | |
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| 1906 |
| | | A pediatrician in Vienna, Clemens von Pirquet, describes a condition for which he coins the term 'allergy' | |
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| 1906 |
| | | The German neuropathologist Alois Alzheimer identifies physical symptoms in the brain of a dead woman who had presenile dementia | |
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