Bear hard, heavily, severely, etc. on somebody
Definition 1 of 3
Pro Tip 1/3Metaphorical Weight
The phrase suggests that stress or pressure feels as heavy as a physical burden. 
The responsibilities of leadership bear heavily on her shoulders.
Pro Tip 2/3Emotional Effect
Can imply that challenges or demands cause emotional strain or stress. 
The recent layoffs bore down hard on the employees’ morale.
Pro Tip 3/3Pressure Source
Identify what's causing pressure to understand the sentence better. 
Her student loans bear heavily on her monthly budget.