A cramp is an unpleasant sensation caused by contraction, usually of a muscle. It can be caused by cold or overexertion. Illness or poisoning can also cause cramps, particularly in the stomach, which is referred to as colic if it fits particular characteristics.
Menstruation also is highly likely to cause cramps of varying severity in the abdomen. Most of this is attributable to the passing of coagulated blood through the cervix.
Cramps from lack of salt and water can be treated by stretching the muscle, and of course drinking water and increasing salt intake.
Electrolyte disturbance may cause cramping and tetany of muscles, particularly hypokalemia (a lack of potassium) and hypocalcemia (a lack of calcium).
Nocturnal leg cramps are involuntary muscle contractions that occur in the calves, soles of the feet or other muscles in the body during the night or (less commonly) while resting.
In a short period of time, the Cramps changed drummers twice; Miriam Linna (later of Nervous Rex, the Zantees, and the A-Bones) replaced Pam Ballam, and Nick Knox (Nicholas Stephanoff, formerly with the Electric Eels) replaced Linna in September 1977.
In the late 1970s, the Cramps briefly shared a rehearsal space with The Fleshtones, and performed regularly in New York at places like CBGB's and Max's Kansas City, releasing two indie singles produced by Alex Chilton at Ardent Studios in Memphis in 1977 before being signed by Miles Copeland to the young I.R.S. Recordslabel.
The Cramps hit the top 40 singles chart on both sides of the Atlantic for the first and only time with "Bikini Girls with Machine Guns"; Ivy posed as such both on the cover of the single and in the promotional video for the song.