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. This is an infection of the outer ear and ear canal. It is also known as an outer ear infection or swimmer's ear. It commonly occurs during the summer months when children swim frequently and their ears stay warm and moist. Typically, otitis externa is treated with ear drops and by keeping the ears dry. More Â».