While acupuncture is not used as a treatment for cancer itself, evidence suggests it can be a valuable therapy for symptoms associated with cancer and the side effects of chemotherapy. In a study of 104 women with breast cancer and nausea from chemotherapy (all of whom were taking anti-nausea medication), women treated with acupuncture experienced fewer attacks of nausea than women who received the medication alone. There have also been studies indicating that acupuncture may help eliminate pain and hot flashes caused by tamoxifen (a breast cancer medication). One study found that acupuncture markedly improved breathlessness in women with late stages of breast cancer. Acupressure (pressing on rather than needling acupuncture points) has also proved useful in controlling breathlessness; this is a technique that individuals can learn and then use to treat themselves.

Some acupuncturists prefer to work with breast cancer patients only after they have completed conventional medical cancer therapy. Others will provide acupuncture and/or herbal therapy during active chemotherapy or radiation. Acupuncturists treat breast cancer patients based on an individualized assessment of the excesses and deficiencies of qi located in various meridians. In many cases of cancer-related symptoms, a qi deficiency is usually detected in the spleen or kidney meridians.