Chronic tension headache Dull achy pain or tight sensation in forehead, sides, top or encircling head Chronic migraine Chronic throbbing headaches that may be associated with nausea and/or vomiting Chronic neck or back pain Chronic dull or sharp pain that may be associated with muscle stiffness Fibromyalgia Diffuse muscular pain associated with stiffness, fatigue and sleep disturbances. Focal pain may be triggered with pressure over areas Myofascial pain syndrome Constant deep pain associated with and caused by ‘trigger points’; trigger points are localized and often painful contracture ‘knots’ in any skeletal muscle. Post-stroke pain Throbbing, shooting or burning pain; loss of temperature differentiation Trigeminal neuralgia Occasional twinges of mild to severe shooting pain that may be triggered by manipulation of areas supplied by the affected trigeminal nerve Sciatica Mild to sharp, burning, electric shock–like pain radiating from the lumbar spine to buttock and down the back of the leg, with or without muscle weakness or numbness in affected areas Complex regional pain Intense burning or aching pain in association with edema, skin discoloration, change in temperature, abnormal sweating and hypersensitivity in affected areas Diabetic neuropathy Numbness and/or burning pain in the distal extremities Phantom limb pain Feelings of cold, warmth, itchiness, tingling or tearing