throbs

noun
  1. 1

    A beating, vibration or palpitation.

verb
  1. 1

    To pound or beat rapidly or violently.

  2. 2

    To vibrate or pulsate with a steady rhythm.

  3. 3

    (of a body part) To pulse (often painfully) in time with the circulation of blood.

Source: https://en.wiktionary.org/wiki/throb, https://en.wiktionary.org/wiki/throbs