The origin of “Charlie horse” is unclear. It is a baseball slang term from the late 1800s that came to mean a painful muscle cramp.
Meaning
A charley horse is a painful muscle cramp or spasm, usually in the calf.
Origin
The origin is unknown. One theory ties it to a lame horse named Charley that pulled a roller at a Chicago ballpark in the 1880s, or a pitcher named Charlie “Old Hoss” Radbourn. The term appeared in baseball slang in the 1880s to describe the stiff gait of players with a leg injury.
Causes
Dehydration, low potassium, magnesium or calcium, overuse, nerve compression and some medicines.
Relief
Stretch the muscle, massage and heat. Drink water.
Night cramps
Common in older adults and pregnancy.
See a doctor if
Cramps are frequent or severe.
What a charley horse is
A charley horse is a muscle cramp or spasm, most often in the calf, thigh or foot. The muscle contracts hard and involuntarily, causing sudden pain that can last from a few seconds to 15 minutes. Soreness may linger for a day. Up to 60% of adults report night leg cramps, according to published surveys.
Origin of the name
The term “charley horse” appeared in American baseball slang in the 1880s. One story links it to a Chicago White Stockings pitcher named Charley “Old Hoss” Radbourn, and another to a lame horse named Charley that pulled a roller at a Chicago ballpark. No version is confirmed, and the origin remains uncertain.
Causes
- Muscle fatigue and overuse, especially after intense exercise.
- Dehydration and electrolyte imbalance in sodium, potassium, calcium or magnesium.
- Sitting or standing in one position for a long time.
- Muscle strain from direct injury, which may cause a deep bruise, called a muscle contusion.
- Medications such as diuretics and statins.
- Pregnancy, with leg cramps common in the second and third trimesters.
- Nerve compression, poor circulation, thyroid disease, diabetes, kidney disease and alcohol use.
Relief
- Stretch the muscle: for a calf cramp, straighten the leg and pull the toes up toward the shin, or stand and press the heel to the floor.
- Massage the area gently.
- Apply heat to tight muscles, or ice for sore ones.
- Walk around when the cramp eases.
- Drink water or a drink with electrolytes.
Night cramps
- Stretch calves for a few minutes before bed.
- Stay hydrated through the day.
- Avoid heavy blankets that point the toes downward.
- Wear supportive shoes during the day.
- Magnesium supplements have limited evidence for night cramps, according to the Cochrane review.
- Quinine is not recommended because of serious side effects, according to the FDA.
See a doctor if
Cramps are severe, frequent, do not improve with stretching, come with swelling, redness, warmth or weakness, or occur after starting a new medicine. Swelling and pain in one leg could be a blood clot (deep vein thrombosis), which needs urgent care.
Uses of the term
The term “charley horse” appears in 19th-century American English, with the earliest uses in baseball around 1886, though its origin is uncertain. One story links it to a lame horse named Charley that pulled a roller at the Chicago White Sox ballpark, and another to a pitcher called Charley “Old Hoss” Radbourn. Medically, it describes a muscle cramp or contusion, often in the calf or thigh. A cramp lasts seconds to 10 minutes. Stretching, massage and hydration help. A deep bruise in the thigh from a blow, also called a charley horse, can cause long-lasting stiffness and rarely a complication called myositis ossificans.
Based on data from Merriam-Webster and the Mayo Clinic
