strains
n. C / Un. the pressure or worry you feel when you have too much to do. It can also mean the physical damage to a muscle from working too hard.
n. the physical or mental pressures resulting from excessive effort or demand. Often refers to the physiological stress placed on a muscle or the psychological tension within a system or relationship.
The long hours at work are putting strains on his health.
The sudden increase in population has put significant strains on the city's public transport system.
Economic sanctions have exacerbated the existing strains within the coalition, leading to public disagreements between the various political factions.
Often used in the plural when referring to multiple sources of pressure or repeated physical injuries.