Dr. Karen Ying-Ying Sun, MD

Going to Dr Sun was the best decision I ever made. She is amazing. My quality of life has improved drastically under her care. Everyone in the office is so professional and kind. Thank you Dr Sun!

Dr Sun is hands-down the best hormone therapy doctor, general practioner in Orange County. The focus and care she gives is admirable. I was really struggling, my quality if life was on a dangerous low, but Dr Sun renewed my faith in feeling human again.

This has to be the best run office ever. Wonderful experience. The medical care I received and the follow-up care was first rate. Excellent methodologies for diagnosis and treatment of issues that many other medical doctors ignored or did not know how to deal with. I highly recommend Dr. Sun for the Bio-identical Hormone pellet and Stem Cell treatments.

Awesome, excellent, thoroughâ?¦cannot say enough about Dr. Sun and her staff...

I only gave 2 stars for "ease of appointment" it was not easy but once I got through to the office, everyone has been more than helpful. Dr. Sun and her staff are patient and EXPLAIN everything. Comfortable and Happy!

I went in and specifically asked Dr. Sun if the spot on my skin is Melanoma. She smiled and said no. She did not take a biopsy nor refer me to a dermatologist. I was in an HMO and without a referall I could not see a dermatologist. At next open enrollment a few months later, I switched to PPO so I can freely visit specialists. I was still suspicious about the spot and went to see a dermatologist. It was Stage 1 Melanoma and I was schedule for surgery immediately. I could have died had I accepted her diagnosis.

Dr. Sun's office is a mill. Everyone is pushed to receive a hormone pellet, administered by an incompetent assistant. The pellet caused me to gain a bunch of weight, although Dr. Sun assured me I would not (even after I cautioned her I always gain weight with estrogen). Once she saw the blood results showing major estrogen overload a month after administering the pellet, she informed me I was "strange", because my body did not react as she expected. She does not think outside the box and one size fits all with this clinic. Also, the dimwit assistant write a prescription for prometerium instead of compounded progesterone as directed by Dr. Sun. I spent 2 weeks thinking I was losing my mind - had a horrible reaction like nothing I have ever experienced.

Dr. Sun is very compassionate and does a great job with bio hormones. She really pulled me out of a bad time with my hormone problems.

It is such a pleasure to deal with your staff. They are always pleasant, patient and eager to assist. I have already referred you to numerous friends for the pellets. I am so grateful I found you Dr. Sun! Thank you.

I am very impressed with Dr.sun. she knows her stuff! I started hormone therapy with her 6 months ago, and I am sleeping better, and have more energy throughout the day. She is very thorough in her medical evaluation of you. I have one more follow-up, then only need to see her a couple timed a year.