Muscle spasms occur when a muscle suddenly becomes tight and uncontrollable. This happens when the muscle remains stretched for an extended period, is dehydrated, or experiences an electrolyte imbalance. Muscle spasms typically happen suddenly, last for a short time, and cause significant pain for the patient.

Aspirin is a non-steroidal anti-inflammatory drug (NSAID) used to relieve pain, reduce swelling, and lower fever. Its active ingredient, acetylsalicylic acid, is a synthetic derivative of salicylic acid.