The various reasons for myalgia or muscle ache or burning along with whole body pain are Dengue, viral flu, lupus, Lyme’s, malaria, polio, electrolyte disturbance especially low potassium (so serum electrolytes should be done), dehydration, fibromyalgia,
multiple sclerosis, inflammation of muscles or myositis (hence CPK-MB should be done), high eosinophil counts, use of certain drugs like statins, and post viral fatigue syndrome.