verb
relieve
rih-LEEV/rɪˈliːv/
To make an unpleasant condition easier to bear.
He relieves her burden by taking the heavy box.

Etymology
The underlying image is lifting people out of trouble or freeing them from a burden, with re- perhaps adding emphasis. Relieving pain or worry makes that burden lighter.
In context
treatment involves surgically draining the hematoma to relieve the pressure with subdural hemorrhages blood comes from the sever bridging veins