Cramps are sudden, involuntary muscle contractions that typically cause brief pain and stiffness. They most often affect the legs but can occur in the abdomen or other muscle groups. This page explains common causes, warning signs to watch for, and which medical specialties can help with evaluation and follow-up.
Muscle cramps usually present as a sudden, sharp pain with tightening or hardening of the muscle. Episodes can last seconds to minutes and may occur during sleep, after strenuous exercise, or with prolonged immobility. Some people experience recurrent attacks in the same muscle groups.
Many factors can trigger cramps. Frequent contributors include dehydration, electrolyte imbalances, muscle fatigue or overuse, prolonged inactivity and exposure to cold. Other possible associations are pregnancy, metabolic conditions (for example diabetes or thyroid disorders), peripheral vascular disease, nerve compression, and certain medications. Age, underlying health conditions and medication use influence the underlying cause.
Most cramps are short-lived, but some situations warrant urgent assessment. Seek immediate medical attention if cramps are accompanied by: severe persistent pain, sudden weakness or loss of sensation, difficulty breathing, chest pain, high fever, or sudden swelling and redness of a leg (which can indicate a blood clot). These signs may reflect a more serious condition requiring prompt care.
Initial assessment is usually done by primary care (family medicine or internal medicine). Depending on findings, referrals may be made to neurology, physical medicine and rehabilitation, orthopedics, cardiology, endocrinology, or obstetrics/gynecology. Possible evaluations include medical history and physical exam, blood tests including electrolytes, metabolic panels, nerve studies (EMG), vascular imaging or other imaging studies. The choice of tests depends on the clinical picture.
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