For what illnesses or conditions is acupuncture really proven to be effective?

Acupuncture trials: Clinical trials have shown strong evidence that acupuncture can decrease nausea and vomiting due to chemotherapy. Studies have shown that acupuncture treatments given as an addition to ivf improve rates of increasing pregnancy. Pilot studies showing improvement in chronic sinusitis. Acupuncture has also shown improvement in function and pain as additional/adjunctive therapy in knee osteoarthritis.

WHO: According to world health organization acupuncture is effective for chemotherapy adverse rxns , allergic rhinitis, depression, dysentery, dysmenorrhea, epigastralgia, facial pain, headache, hypertension, hypotension, labor induction, pain (knee, neck & back), leukopenia, fetus malposition, morning sickness, nausea, vomiting, dental pain, shoulder arthritis, postoperative pain, renal colic, etc.