Use 'overburden' when someone feels overwhelmed by too many tasks or pressures. She felt overburdened by the demands of her new job.
Pro Tip 2/3
Not Just Physical
Although it sounds physical, 'overburden' often refers to emotional or mental strain as well. Parents can sometimes feel overburdened by the responsibilities of childcare.
Pro Tip 3/3
Avoid Overuse
'Overburden' is powerful in the right context, but overusing it can weaken its impact. Saying that you're overburdened every day can make others take it less seriously.