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Chapters

0:00 Introduction
0:45 Causes of Muscle Pain
1:57 Symptoms of Muscle Pain
2:06 You should seek medical attention if:
2:30 Treatment for Muscle Pain


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, and chronic fatigue 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.

The most common causes are:[citation needed]

Injury or trauma, including sprains, hematoma
Overuse: using a muscle too much, too often, including protecting a separate injury
Chronic tension

Muscle pain occurs with:

Rhabdomyolysis, associated with:
Viral
Compression injury leading to crush syndrome
Drug-related
Commonly fibrates and statins
Occasionally ACE inhibitors, cocaine, and some retro-viral drugs
Severe potassium deficiency
Fibromyalgia
Ehlers-Danlos syndrome
Auto-immune disorders, including:
Mixed connective tissue disease
Systemic lupus erythematosus
Polymyalgia rheumatica
Polymyositis
Dermatomyositis
Multiple sclerosis (this is neurologic pain localised to myotome)
Infections, including:
Influenza (the flu)
Lyme disease
Babesiosis
Malaria
Toxoplasmosis
Dengue fever
Hemorrhagic fever
Muscular abscess
Compartment syndrome
Polio
Rocky Mountain spotted fever
Trichinosis (roundworm)
Ebola
COVID-19
Other
Postorgasmic illness syndrome (POIS)[1][2][3]

Overuse

Overuse of a muscle is using it too much, too soon or too often.[4] One example is repetitive strain injury. See also:

Exercise
Weight lifting

Injury

The most common causes of myalgia by injury are: sprains and strains.[4]
Autoimmune

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

Metabolic defect

Carnitine palmitoyltransferase II deficiency
Conn's syndrome
Adrenal insufficiency
Hyperthyroidism
Hypothyroidism
Diabetes
Hypogonadism
Postorgasmic illness syndrome[1][2][3]

Other

Chronic fatigue syndrome (aka myalgic encephalomyelitis)
Channelopathy
Ehlers Danlos Syndrome
Stickler Syndrome
Hypokalemia
Hypotonia
Exercise intolerance
Mastocytosis
Peripheral neuropathy
Eosinophilia myalgia syndrome
Barcoo Fever
Herpes
Hemochromatosis
Delayed onset muscle soreness
HIV/AIDS
Generalized anxiety disorder
Tumor-induced osteomalacia
Hypovitaminosis D
Infarction[5]

Withdrawal syndrome from certain drugs

Sudden cessation of high-dose corticosteroids, opioids, barbiturates, benzodiazepines, caffeine, or alcohol can induce myalgia.[citation needed]