In 2003, the World Health Organization published a landmark study, titled "Acupuncture: Review and Analysis of Reports on Controlled Clinical Trials".
Diseases and disorders that can be treated with acupuncture

Upper Respiratory Tract
Acute sinusitis - Acute rhinitis, Common Cold - Acute tonsillitis
Respiratory System
Acute bronchitis - Bronchial asthma
Disorders of the Eye
Acute conjunctivitis - Central retinitis, Myopia (children) - Cataract
Disorders of the Mouth
Toothache, post-extraction pain,
Gingivitis - Acute and chronic pharyngitis
Gastrointestinal Disorders
Spasms of oesophagus and cardia, Hiccough - Gastroptosis
Acute and chronic gastritis - Gastric hyperacidity - Chronic duodenal ulcer (pain relief) - Acute duodenal ulcer  - Acute and chronic colitis - Acute bacillary dysentery, Constipation - Diarrhoea - Paralytic ileus
Neurological and Musculo-skeletal Disorders
Headache and migraine - Trigeminal neuralgia, Facial palsy (early stage, i.e., within three to six months) - Pareses     following a stroke
Peripheral neuropathies - Sequelae of poliomyelitis (early stage, i.e., within six months) - Meniere's disease - Neurogenic bladder dysfunction - Nocturnal enuresis
Intercostal neuralgia - Cervicobrachial syndrome - “Frozen shoulder”, “tennis elbow”
Sciatica - Low back pain - Osteoarthritis
The most common conditions include:
Chronic pain - Neck and Back pain - Migraine - Headaches - Acute injury-related pain - Sprains - Strains
Indigestion - Ulcers - Constipation - Diarrhoea
Cardiovascular conditions - High and low blood pressure
Menstrual irregularity - Infertility - Impotence
Muscle and nerve - Paralysis - Deafness
Addictive Behaviours - Substance abuse - Overeating - Drug dependence - Smoking, Surgery - Anaesthesia