Το χαμένο έργο "Περί αλυπίας" του Γαληνού ανακαλύφθηκε τυχαία το 2005 στη Θεσσαλονίκη. Το χειρόγραφο βρέθηκε στη Μονή Βλατάδων από τον νεαρό Γάλλο ερευνητή Antoine Pietrobelli, που έτυχε να εργάζεται εκεί. Το θέμα του Γαληνού είναι η αποφυγή της θλίψης με τη βοήθεια της φιλοσοφίας. Η απώλεια, η κακοδαιμονία, οι συμφορές που μας τυχαίνουν και μας βυθίζουν στη στενοχώρια, για τους Έλληνες φιλοσόφους δεν ήταν παρά προκλήσεις-ευκαιρίες να επιβεβαιώσουν την αποτελεσματικότητα των όπλων τους, κάνοντας πράξη τη θεωρία τους. Ο Γαληνός περιγράφει σε ένα φίλο του το μέγεθος της συμφοράς που τον βρήκε: σε μια πυρκαγιά έχασε ό,τι είχε και δεν είχε -για την ακρίβεια, όλα όσα είχαν γι' αυτόν αξία-, όλα τα βιβλία που είχε συγγράψει, όλα τα ιατρικά του εργαλεία, τα φάρμακα και τις συνταγές του, τα έργα των άλλων συγγραφέων που είχε στη βιβλιοθήκη του. Ο φίλος του είχε ζητήσει να μάθει για ποιο λόγο ο Γαληνός δεν έδειξε να θλίβεται για αυτή την τόσο μεγάλη απώλεια και συνέχιζε τη ζωή του σαν να μην είχε συμβεί τίποτε. Η απάντηση/πραγματεία του Γαληνού βοηθά τον αναγνώστη να αναγνωρίσει ότι το υπέρτατο συμφέρον του έγκειται στη σωστή αξιολόγηση των υλικών αποκτημάτων: μια διαχρονική αλήθεια που διατηρεί την ισχύ της σε όλες τις εποχές και όλους τους τόπους... (Από την παρουσίαση στο οπισθόφυλλο του βιβλίου)
Aelius Galenus or Claudius Galenus (AD 129–c. 200/c. 216), better known as Galen of Pergamon (modern-day Bergama, Turkey), was a prominent Roman (of Greek ethnicity) physician, surgeon and philosopher. Arguably the most accomplished of all medical researchers of antiquity, Galen contributed greatly to the understanding of numerous scientific disciplines, including anatomy, physiology, pathology, pharmacology, and neurology, as well as philosophy and logic.
The son of Aelius Nicon, a wealthy architect with scholarly interests, Galen received a comprehensive education that prepared him for a successful career as a physician and philosopher. He traveled extensively, exposing himself to a wide variety of medical theories and discoveries before settling in Rome, where he served prominent members of Roman society and eventually was given the position of personal physician to several emperors.
Galen's understanding of anatomy and medicine was principally influenced by the then-current theory of humorism, as advanced by many ancient Greek physicians such as Hippocrates. His theories dominated and influenced Western medical science for more than 1,300 years. His anatomical reports, based mainly on dissection of monkeys, especially the Barbary Macaque, and pigs, remained uncontested until 1543, when printed descriptions and illustrations of human dissections were published in the seminal work De humani corporis fabrica by Andreas Vesalius where Galen's physiological theory was accommodated to these new observations. Galen's theory of the physiology of the circulatory system endured until 1628, when William Harvey published his treatise entitled De motu cordis, in which he established that blood circulates, with the heart acting as a pump. Medical students continued to study Galen's writings until well into the 19th century. Galen conducted many nerve ligation experiments that supported the theory, which is still accepted today, that the brain controls all the motions of the muscles by means of the cranial and peripheral nervous systems.
Galen saw himself as both a physician and a philosopher, as he wrote in his treatise entitled That the Best Physician is also a Philosopher. Galen was very interested in the debate between the rationalist and empiricist medical sects, and his use of direct observation, dissection and vivisection represents a complex middle ground between the extremes of those two viewpoints. Many of his works have been preserved and/or translated from the original Greek, although many were destroyed and some credited to him are believed to be spurious. Although there is some debate over the date of his death, he was no younger than seventy when he died.