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					 			      	Muscle Cramps - PatientInfo
					 			      	 
 Muscle cramps are very common and 'cramp' is usually taken to mean 'a spasmodic, painful, involuntary contraction of skeletal muscle'. This transient, involuntary episode of pain is usually brief ( less than 10 minutes). http://patient.info/doctor/muscle-cramps
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					 			      	Muscle Cramps - MedlinePlus
					 			      	 
 Muscle cramps are sudden, involuntary contractions or spasms in one or more of your muscles. They often occur after exercise or at night, lasting a few seconds to several minutes. It is a very common muscle problem. https://medlineplus.gov/musclecramps.html
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					 			      	Muscle Cramp Symptoms and Causes - Mayo Clinic
					 			      	 
 Most muscle cramps develop in the leg muscles, particularly in the calf. Besides the sudden, sharp pain, you might also feel or see a hard lump of muscle tissue beneath your skin. http://www.mayoclinic.org/diseases-conditions/muscle-cramp/symptoms-causes/dxc-20186052
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					 			      	Leg Cramps - NHS Choices
					 			      	 
 Leg cramps are a common condition where the muscles in the leg suddenly become tight and painful. http://www.nhs.uk/conditions/legcrampsunknowncause/pages/introduction.aspx
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					 			      	Muscle Cramps - Sports Medicine Information
					 			      	 
 The term 'muscle cramp' refers to a contraction of the muscle which is involuntary and can be very painful. Muscle cramp can also be referred to as muscle spasms. Cramp is an extremely common problem for athletes and those engaging in sports activity, and can occur in any skeletal muscle. http://www.nsmi.org.uk/articles/muscle-cramps.html
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					 			      	Cramp Facts, Information, Pictures - Encyclopedia
					 			      	 
 Get information, facts, and pictures about cramp at Encyclopedia.com. Make research projects and school reports about  cramp easy with credible articles from our FREE, online encyclopedia and dictionary. http://www.encyclopedia.com/topic/cramp.aspx
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					 			      	Muscle Cramps: Healthwise Medical Information - eMedicineHealth
					 			      	 
 Information on Muscle Cramps. Includes topic overview and related information. http://www.emedicinehealth.com/muscle_cramps-health/article_em.htm
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					 			      	Leg Cramps, Muscle Pain/Aches, Common Leg Cramps - Patientinfo
					 			      	 
 Leg cramps are common. The cause is not known in most cases. Get information and advise about Leg Cramps, Muscle Pain and muscle aches. http://patient.info/health/cramps-in-the-leg
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					 			      	Muscle Cramps, Charley Horse, and Muscle Spasms: Causes and Treatments - WebMD
					 			      	 
 WebMD explains muscle spasms, cramps and charley horses, including symptoms, causes and treatments. http://www.webmd.com/pain-management/muscle-spasms-cramps-charley-horse
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					 			      	Muscle Cramps: Read About Treatment, Causes and Prevention - Medicine Net
					 			      	 
 Get information on muscle cramps (charley horses), including leg cramps, causes (vitamin deficiency, drugs, lactic acid, dehydration, low calcium, potassium or magnesium), treatment, and prevention. http://www.medicinenet.com/muscle_cramps/article.htm
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					 			      	Muscle Cramp - Mayo Clinic
					 			      	 
 Muscle cramp - Comprehensive overview covers causes, treatment, prevention of cramped muscles. http://www.mayoclinic.org/diseases-conditions/muscle-cramp/home/ovc-20186047
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					 			      	Muscle Cramps: MedlinePlus
					 			      	 
 Muscle cramps are sudden, involuntary contractions or spasms in one or more of your muscles. They often occur after exercise or at night, lasting a few seconds to several minutes. It is a very common muscle problem. https://www.nlm.nih.gov/medlineplus/musclecramps.html
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					 			      	Muscle Cramps: Read More About Symptoms and Causes -  emedicinehealth
					 			      	 
 Muscle cramps may be caused by dehydration, fatigue, pregnancy and certain medications. Learn about the symptoms, treatment and prevention of muscle spasms (charley horses). http://www.emedicinehealth.com/muscle_cramps/article_em.htm
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					 			      	How to Stop Leg Muscle Cramps - Healthline
					 			      	 
 Cramps can be a real nightmare, especially when they wake you at night. Leg cramps most commonly hit your calves and hamstrings, though they can show up in just about any muscle. http://www.healthline.com/health/pain-relief/how-to-stop-leg-muscle-cramps
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					 			      	Muscle Cramp - AAOS
					 			      	 
 Just about everyone will experience a muscle cramp sometime in life. It can happen while you play tennis or golf, bowl, swim, or do any exercise. It can also happen while you sit, walk, or even just sleep. Sometimes the slightest movement that shortens a muscle can trigger a cramp. http://orthoinfo.aaos.org/topic.cfm?topic=a00200