[hinckley buzzard]

Psychosomatic illnesses were first identified explicitly by ancient Egyptian physicians. The concept of hysteria arose there. Really. What Shakespeare knew was probably common folk wisdom.

[RegulatorCountry]

Common folk wisdom persisted down through the centuries because it had value, predictive, medical and otherwise. Ignoring or even denigrating it was and is arrogant and foolhardy, imho.

[Apollo5600]

You’re probably right. Shakespeare was also a great student of human nature as well.