The World Health Organization (WHO) has recognized acupuncture to be beneficial in the treatment of the following conditions as reported in their published review and analysis of controlled clinical trials of acupuncture therapy:

Pain
Head and face, TMJ, muscle pain, joint pain, neck pain, arthritis, fibromyalgia, epicondylitis (tennis elbow), low back pain, sciatica, osteoarthritis, rheumatoid arthritis, gout, biliary/renal colic, post-operative pain, dental pain, tooth extraction, peridontitis, childbirth, sprains, strains, inflammation, and infection

Rheumatologic Conditions
Arthritis, Raynauds's syndrome, Sjogren syndrome

Neurological Conditions
Headache, migraine, tension headache, neuralgia, stroke, paresis, hemiplegia, herpetic neuralgia, Bell's palsy, facial spasm, Insomnia

Respiratory Conditions
Rhinitis, tonsillitis, asthma, sore throat, hay fever, and allergies

Digestive Conditions
Peptic ulcer, gastritis, nausea, vomiting, ulcerative colitis, irritable bowel syndrome, Cholelithiasis (gall stones), Cholecystitis (inflammation of the gall bladder)

Urinary/Genital Disorders
Urinary retention, recurrent urinary tract infections, kidney stones, sexual dysfunction, ejaculation disorders, prostatitis

Gynecological Disorders
Dysmenorrhea, pre-menstrual syndrome, infertility, morning sickness, and deficient lactation, mal-position of the fetus, induction of labor, polycystic ovary syndrome

Cardiovascular Disorders
Hypertension, hypotension, angina, coronary artery disease, hyperlipidemia

Psychological Disorders
Depression, anxiety, dependancies, smoking cessation, alcohol abuse/addiction, schizophrenia

Cancer Related Disorders
Cancer pain, chemotherapy reactions

Skin Disorders
Herpes zoster, acne, puritis (itching)

Sense Organ Disorders
Miniere's disease, tinnitis, earache

Pediatric Disorders
Diarrhea, convulsions from high fever, Tourettes syndrome

Immune System
Bacillary dysentary, stimulates immune function, pertussis, cough, Hepatitis B

Endocrine system
Non-insulin dependant diabetes mellitus, premenstrual syndrome

Source: World Health Organization