Stoicism refers to the endurance of pain or hardship without the display of feelings or complaint. It also refers to an ancient Greek/Roman school of philosophy which taught that it is best to accept unavoidable suffering by developing self-control and fortitude and by remaining detached to worldly matters, focusing instead on cultivating virtue. Colloquially the phase refers to impassive acceptance and/or mental toughness in the face of hardships.
Men are generally more likely to downplay their hardship and disease. It has been suggested that this comes from women preferring such men. After all women depend on men, and thus discard men who are not dependable. Within the androsphere, stoicism is a key feature of the whitepill.