Myalgia (also called muscle pain and muscle ache in layman's terms) is the medical term for muscle pain. Myalgia is a symptom of many diseases. The most common cause of acute myalgia is the overuse of a muscle or group of muscles; another likely cause is viral infection, especially when there has been no trauma.
Long-lasting myalgia can be caused by metabolic myopathy, some nutritional deficiencies, chronic fatigue syndrome, fibromyalgia, and amplified musculoskeletal pain syndrome.
The most common causes of myalgia are overuse, injury, and strain. Myalgia might also be caused by allergies, diseases, medications, or as a response to a vaccination. Dehydration at times results in muscle pain as well, especially for people involved in extensive physical activities such as workout.
Muscle pain is also a common symptom in a variety of diseases, including infectious diseases, such as influenza, muscle abscesses, Lyme disease, malaria, trichinosis or poliomyelitis; autoimmune diseases, such as celiac disease, systemic lupus erythematosus, Sjögren's syndrome or polymyositis; gastrointestinal diseases, such as non-celiac gluten sensitivity (which can also occur without digestive symptoms) and inflammatory bowel disease (including Crohn's disease and ulcerative colitis).
The most common causes are:
Overuse of a muscle is using it too much, too soon or too often. One example is repetitive strain injury. See also:
Exercise
Weight lifting
The most common causes of myalgia by injury are: sprains and strains.
Multiple sclerosis (neurologic pain interpreted as muscular)
Myositis
Mixed connective tissue disease
Lupus erythematosus
Fibromyalgia syndrome
Familial Mediterranean fever
Polyarteritis nodosa
Devic's disease
Morphea
Sarcoidosis
Carnitine palmitoyltransferase II deficiency
Conn's syndrome
Adrenal insufficiency
Hyperthyroidism
Hypothyroidism
Diabetes
Hypogonadism
Postorgasmic illness syndrome
Chronic fatigue syndrome (a.k.a.
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