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Jennifer Aniston is seeking treatment at The Chung Hua Institute in Santa Monica for a knee injury she suffered during her romantic getaway to Kauai with beau Justin Theroux.

We're told the Friends star spent over two hours seeing a specialist.

A source tells X17online exclusively:

    "Jen has been in extreme pain for the past two weeks. Surfing isn't really her thing, but she gave it a try with Justin. She didn't think her injury was that bad, but since they got back from Hawaii, her knee has gotten worse."

The institute, frequently visited by numerous celebrities, is known for offering Tui-Na Chinese orthopedic manual medicine treatments, acupuncture, and Functional Movement Systems (FMS) neuromuscular re-patterning training.