Some examples include...

Arthritic pain
Circulatory problems
Cramp
Digestion problems
Fibromyalgia
Frozen shoulder/ shoulder and elbow pain/ tennis elbow
Headache arising from the neck (cervicogenic)
Joint pains including osteoarthritis
General, acute & chronic backache, back pain
Generalised aches and pains
Low back pain (lumbago)
Migraine prevention
Minor sports injuries
Muscle spasms
Neuralgia
Tension and inability to relax
Rheumatic pain
Sciatica
Uncomplicated mechanical neck pain