What are the reasons for decreased libido?

Patient's question:

Age
Detailed medical condition and consultation purpose: Doctor, hello! Since the end of March, my libido has suddenly decreased, and my sexual function has become poor. Previously, my libido was very high, and I don’t know what could have caused it to change suddenly. I also have chronic hepatitis B and prostatitis, so I’m unsure what the cause could be. Currently, hepatitis B has no symptoms, with positive 1 and 5, and negative HBVDNA. There is splenomegaly. A few days ago, I underwent a thorough examination at the urology hospital, including sex hormone testing, routine prostatic examination, prostatic ultrasound, penile cavernous blood flow measurement, and erection test. Among these, the penile cavernous blood flow measurement and erection test were both normal.

Doctor's answer:

Considering the possibility of kidney Yang deficiency, it is recommended to seek treatment from a traditional Chinese medicine practitioner for syndrome differentiation. The main symptoms include cold hands and feet, a tendency for the face to appear yellowish or pale, aversion to cold, and if the person is in middle or young adulthood, a decrease in libido. There is often a feeling of constant spiritual fatigue, as it is a functional issue, and it is more reflected in this aspect. Oral administration of Jinkui Shenqi Pills and Yougui Pills can be helpful. Dietary therapy is also very important, and consuming more mutton and dog meat can be very effective.