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 can also be caused by putting objects into the ear canal. Objects to clean the ear (for example, paper clips, bobby pins, or fingernails) should not be used as they may tear the skin. Most people have ears that are self-cleansing, cleaning with a cotton-tipped swab is unnecessary and potentially harmful.