अत्यधिक पीड़ा होना।

आज सुबह से मेरा सर फट रहा है।
फटना

Erupt or intensify suddenly.

Unrest erupted in the country.
Tempers flared at the meeting.
The crowd irrupted into a burst of patriotism.
break open, burst out, erupt, flare, flare up, irrupt