The cause of muscle cramps isn't always known. Muscle cramps may be brought on by many conditions or activities, such as: 1  Exercising, injury, or overuse of muscles. 2  Pregnancy. 3  Cramps may occur because of decreased amounts of minerals, such as calcium and magnesium, especially in the later months of pregnancy.
Causes of Otitis externa. Causes of Otitis externa. Otitis externa is caused by a bacterial or viral infection in the external part of the ear canal. A common bacterial pathogen is Pseudomonas aeruginosa. List of causes of Otitis externa. Otitis externa Causes: Risk Factors.
Causes of Otitis Media. The most common ear infection (otitis media) causes are bacteria and viruses that get inside the ear. People who are at risk for otitis media include children who are cared for in group settings, children who live with adults who smoke cigarettes, and infants who nurse from a bottle while lying down.