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.
Otitis Externa: Otitis Externa may or may not be caused by pathogenic infections. Swimming in contaminated water is one of the reasons of contracting swimmerâs ear. People using swimming pools are at greater risk of this inflammation as the combination of water and chlorine changes the âpHâ balance of the ear from acidic to alkaline.