Read the dictionary definition of throb. All definitions for this word.
1. an instance of rapid strong pulsation (of the heart)
1. he felt a throbbing in his head
2. a deep pulsating type of pain
3. expand and contract rhythmically; beat rhythmically
1. The baby's heart was pulsating again after the surgeon massaged it
4. tremble convulsively, as from fear or excitement
5. pulsate or pound with abnormal force
1. my head is throbbing
2. Her heart was throbbing