Photobiomodulation in Head and Neck Cancer-Related Chronic Lymphedema

This study tests photobiomodulation therapy — the use of low-level laser or light — to treat chronic lymphedema of the head and neck that persists after cancer treatment. Lymphedema causes painful, persistent swelling that can significantly affect swallowing, speech, and quality of life. **You may be eligible if...** - You are over 18 years old - You have been diagnosed with head and neck cancer (confirmed by biopsy) - You show no signs of active cancer at time of enrollment, and it has been 12 to 60 months since completing cancer treatment - You have chronic lymphedema (swelling that has persisted for at least 6 months) affecting at least 2 external sites - At least one area of swelling is moderate or severe - Prior lymphedema therapy has not fully resolved your symptoms - You can understand English and provide informed consent **You may NOT be eligible if...** - Your lymphedema is recent (less than 6 months) - You have active cancer - You do not meet the criteria for failed prior therapy Talk to your doctor to see if this trial is right for you.