Generally the cause of cramp is not having enough salt in your diet.
The most common cause is dehydration combined with overuse of that muscle (e.g. repeated interval running or long-distance running).
When a muscle cramp occurs, the muscle contracts forcibly and involuntarily and doesn't relax for the time the cramp lasts. The cramp can last from few seconds up to few minutes.
A muscle cramp is likely due to a lack of
When you experience a leg or muscle cramp, it is because the muscle has constricted or tightened up. The lump you are referring to is the muscle itself that has tightened up. When your muscle relaxes, the cramp goes away.
A painful contraction of a muscle is a cramp or charley horse.
Stop doing whatever activity triggered the cramp, Gently stretch and massage the cramping muscle, holding it in stretched position until the cramp stops, and Apply heat to tense/tight muscles, or cold to sore/tender muscles.
Often it is called a cramp.
A spasm or cramp
Such a painful muscle contraction is commonly known as cramp.
after a long period of exercise a muscle can cramp
a cramp
I recommend massage.
Any muscle in your body can cramp