Reliever (noun)

1. A person or thing that provides relief or reduces stress or discomfort.
2. A person or thing that lessens pain, stress or discomfort.

Origin:

Late 17th century, from relieve + -er.

Examples:

1. Aspirin is a great reliever for headaches.
2. The reliever pitcher helped the team win the game.
3. A hot bath is a good reliever for muscle pain.
4. The reliever was called in to help the exhausted nurse.
5. The reliever medication provided instant relief from the symptoms.