Yes, you may be eligible for worker’s compensation benefits in California even if you have a pre-existing condition. Under California law, specifically labor Code Section 4663, the existence of a prior health condition doesn’t prevent an employee from receiving compensation. However, to qualify for these benefits, the worker must establish a direct causal link between the workplace injury and the worsening of their condition. 

This requires strong medical evidence such as expert reports, medical records, or statements from specialists,  proving that the work-related incident significantly contributed to the aggravation of the pre existing condition. For example, if a worker with a history of back pain experiences increased discomfort after lifting heavy equipment at work, they must demonstrate that the workplace injury directly worsen their condition. 

Due to the complexity of legal requirements and the burden of proof, it’s highly recommended to seek the assistance of a worker’s compensation attorney.